I. Overview

In the Philippines, a child’s birth certificate is more than a record of birth. It is a civil registry document that establishes key facts about a person: name, date and place of birth, sex, citizenship-related details, and parentage. When the father’s name is left blank on a child’s Certificate of Live Birth, the omission has important legal consequences, especially on filiation, surname, parental authority, support, inheritance, custody, legitimation, and later correction or amendment of civil registry records.

A blank father’s name does not mean that the child has no biological father. It means that, for civil registry purposes, no father has been legally recorded or acknowledged in the birth certificate at the time of registration.

In Philippine law, this situation commonly arises when the child is born to parents who are not married to each other, and the father does not acknowledge the child at the time of birth registration.

II. Legal Status of the Child When the Father’s Name Is Blank

The legal status of the child depends mainly on whether the parents were married to each other at the time of conception or birth.

A. If the Mother Was Married

If the mother was married at the time of conception or birth, Philippine law generally presumes that the child is the legitimate child of the mother’s husband. This presumption exists under the Family Code.

In that situation, the father’s name should ordinarily be that of the husband, unless there is a lawful basis to dispute legitimacy. A blank father’s name in this context may indicate an irregularity, an incomplete registration, or a complicated factual situation involving questions of legitimacy, paternity, or possible impugnation.

Questions involving a married mother and a blank father’s name can become legally sensitive because the law protects the legitimacy of children and imposes strict rules on who may challenge it and within what period.

B. If the Mother Was Not Married

If the mother was not married to the biological father, the child is generally considered an illegitimate child unless the parents later validly marry and the law allows legitimation.

For children born outside marriage, the father’s details may be entered in the birth certificate only if there is proper acknowledgment or admission of paternity.

If the father does not acknowledge the child, the father’s name is usually left blank.

III. Why the Father’s Name May Be Blank

A father’s name may be blank on a Philippine birth certificate for several reasons:

The parents were not married, and the father did not sign or execute an acknowledgment.
The mother chose not to identify the father.
The father was unavailable at the time of birth registration.
The father refused to acknowledge the child.
The identity of the father was uncertain or disputed.
The birth was registered late, and no valid proof of paternity was submitted.
The civil registrar required documentary proof before entering the father’s name.
There was an error, omission, or incomplete entry during registration.

The most common legal reason is the absence of the father’s voluntary acknowledgment.

IV. Effect on the Child’s Surname

A child whose father’s name is blank on the birth certificate will usually carry the mother’s surname.

Under Philippine rules, an illegitimate child generally uses the surname of the mother. However, Republic Act No. 9255 amended Article 176 of the Family Code and allowed an illegitimate child to use the father’s surname if the father expressly recognizes the child in the manner required by law.

Therefore, if the father has not acknowledged the child, the child ordinarily cannot use the father’s surname merely because he is alleged to be the biological father.

The right to use the father’s surname requires legal recognition, not merely biological connection.

V. A Blank Father’s Name and Illegitimacy

When the father’s name is blank, the child is commonly treated as an illegitimate child for civil registry purposes, especially where the mother is unmarried.

However, the birth certificate alone does not always tell the whole story. The child’s legal status may depend on other facts, such as:

whether the mother was married;
whether the parents later married;
whether the father executed an acknowledgment;
whether there is a separate public document recognizing the child;
whether there was a court judgment establishing paternity;
whether the child was later legitimated.

Still, as a practical matter, a blank father’s name usually means that the child has no recorded legal father in the civil registry.

VI. Acknowledgment of Paternity

For the father’s name to be entered on the birth certificate of a child born outside marriage, there must be a valid acknowledgment of paternity.

Acknowledgment may be made through:

signing the birth certificate;
executing an affidavit of acknowledgment or admission of paternity;
executing a public document recognizing the child;
making a recognition in a handwritten instrument;
other legally acceptable proof, depending on the circumstances;
a court judgment establishing paternity.

The father’s mere verbal admission is generally not enough for civil registry purposes. The civil registrar typically requires documentary proof.

VII. Can the Father’s Name Be Added Later?

Yes, the father’s name may be added later, but the method depends on the reason for the omission and the available proof.

A. If the Father Voluntarily Acknowledges the Child

If the father is willing to acknowledge the child, he may execute the necessary documents, usually an Affidavit of Admission of Paternity or similar instrument. Depending on the case, the parties may also execute documents under the rules implementing Republic Act No. 9255 if the child will use the father’s surname.

The documents are then submitted to the Local Civil Registrar where the birth was registered.

The civil registry annotation may reflect the father’s acknowledgment and, when proper, the child’s use of the father’s surname.

B. If the Father Refuses to Acknowledge the Child

If the father refuses to acknowledge the child, the mother or the child may need to file a court action to establish paternity or filiation.

This may involve evidence such as:

DNA evidence;
written communications;
photographs;
proof of relationship between the parents;
support given by the alleged father;
public treatment of the child as his own;
school, medical, baptismal, or other records;
testimony of witnesses;
documents signed by the father.

A court judgment may then serve as the basis for changing or annotating the civil registry record.

C. If the Blank Entry Was Due to Clerical Error

If the father’s name was omitted by mistake despite proper acknowledgment at the time of registration, the remedy may depend on whether the correction is considered clerical or substantial.

Adding a father’s name is usually treated as a substantial change because it affects filiation. Substantial changes generally require a judicial proceeding, unless the case falls within an administrative procedure allowed by law and civil registry rules.

VIII. Administrative Correction vs. Court Proceeding

Not all civil registry errors are corrected in the same way.

A. Administrative Correction

Republic Act No. 9048, as amended by Republic Act No. 10172, allows certain corrections in civil registry documents without going to court. These generally include clerical or typographical errors, changes of first name or nickname under certain grounds, and corrections of sex or date of birth where allowed by law.

However, adding a father’s name is usually not a simple typographical correction. It affects the child’s filiation and legal rights.

B. Judicial Correction

A court proceeding is usually required when the requested change involves:

nationality;
legitimacy or illegitimacy;
filiation;
paternity;
substantial changes in civil status;
adding or changing a parent’s name where paternity is disputed or not previously acknowledged.

Thus, if the father’s name is blank and there is no voluntary acknowledgment, a court case may be necessary.

IX. Use of the Father’s Surname Under RA 9255

Republic Act No. 9255 allows an illegitimate child to use the surname of the father if the father has expressly recognized the child.

This law does not automatically make the child legitimate. It only allows the child to use the father’s surname after proper acknowledgment.

Important points:

The child remains illegitimate unless legitimated under law.
The father’s acknowledgment is required.
The birth certificate may be annotated.
The child’s surname may be changed or recorded according to the applicable civil registry rules.
The use of the father’s surname does not erase the mother’s parental rights.
Recognition may affect support, succession, and proof of filiation.

The law gives an illegitimate child the option to use the father’s surname when legally recognized, but it does not force the child to do so in every case.

X. Parental Authority When Father’s Name Is Blank

Under the Family Code, parental authority over an illegitimate child generally belongs to the mother.

Even if the father later acknowledges the child, the mother usually retains parental authority over the illegitimate child, unless a court rules otherwise in a proper case.

A blank father’s name strengthens the practical reality that only the mother is clearly reflected as the legal parent in the birth record.

The father may still have obligations, especially support, if paternity is established. But parental authority and custody are separate from biological fatherhood.

XI. Custody Implications

For an illegitimate child, custody is generally with the mother.

The biological father cannot simply demand custody because he claims to be the father. He must first establish legal paternity, and even then, the mother’s preferential parental authority over an illegitimate child remains a major legal factor.

Courts decide custody based on the welfare and best interests of the child. However, for illegitimate children, Philippine law strongly recognizes the mother’s parental authority.

A blank father’s name may make it harder for the alleged father to assert immediate custodial rights without first proving paternity.

XII. Child Support

A blank father’s name does not permanently prevent a child from claiming support from the biological father.

However, before support can be compelled, paternity or filiation must be established. If the father voluntarily acknowledges the child, support may be demanded from him. If he refuses, the child or mother may have to bring a legal action.

Support may include:

food;
clothing;
shelter;
medical care;
education;
transportation;
other necessities consistent with the family’s financial capacity and social position.

A father who is not listed in the birth certificate may still be ordered to provide support if paternity is proven.

XIII. Inheritance Rights

The child’s inheritance rights depend on filiation.

An acknowledged illegitimate child has inheritance rights from the father, although the share of an illegitimate child is different from that of a legitimate child.

If the father’s name is blank and paternity is never established, the child may have difficulty asserting inheritance rights from the alleged father.

This is especially important when the alleged father dies. Claims involving inheritance and filiation become more complicated after death because evidence may be harder to obtain, and the law imposes rules on when and how filiation may be proved.

XIV. Proof of Filiation

Filiation may be established by:

the record of birth appearing in the civil register;
an admission of filiation in a public document;
an admission in a private handwritten instrument signed by the parent;
other evidence allowed by the Rules of Court and jurisprudence.

If the father’s name is blank, the birth certificate itself does not establish paternal filiation. The child must rely on other proof.

DNA testing may be relevant in contested paternity cases, but it is usually part of a judicial process rather than a simple civil registry correction.

XV. Late Registration of Birth With Blank Father’s Name

If a child’s birth is registered late and the father does not acknowledge the child, the father’s name may still be left blank.

Late registration usually requires additional documents, such as affidavits and proof of birth. But late registration does not allow the mother or informant to unilaterally place the alleged father’s name without legal basis.

If the father acknowledges the child during late registration, his name may be included subject to civil registrar requirements.

XVI. Can the Mother Put the Father’s Name Without His Consent?

Generally, no.

For a child born outside marriage, the father’s name should not be entered solely on the mother’s declaration if the father has not acknowledged the child.

This protects against false attribution of paternity and ensures that the entry in the civil register is supported by legally recognized proof.

If the mother believes a man is the father but he refuses acknowledgment, the proper remedy is not unilateral entry but legal action to establish paternity.

XVII. Can the Father Later Demand to Be Placed on the Birth Certificate?

A father who later wants to acknowledge the child may usually do so by executing the required acknowledgment documents.

However, the process must comply with civil registry rules. The father cannot simply demand an informal alteration. The birth certificate must be annotated or corrected through the proper administrative or judicial process.

If there is a dispute, such as the mother objecting or another man being legally presumed as father, the matter may require court intervention.

XVIII. Legitimation

Legitimation is a legal process by which a child who was born outside marriage becomes legitimate because the parents later validly marry, provided the child was not disqualified by law from being legitimated.

For legitimation to apply, the parents must generally have had no legal impediment to marry each other at the time of the child’s conception, subject to specific rules under Philippine law.

If the father’s name is blank but the biological parents later marry, the birth record may need to be updated through the proper legitimation process. This usually requires documents such as:

the child’s birth certificate;
the parents’ marriage certificate;
acknowledgment or proof of paternity;
affidavits or legitimation documents required by the civil registrar.

Legitimation changes the child’s status from illegitimate to legitimate. This affects surname, parental authority, inheritance, and other family rights.

XIX. Adoption Is Different From Adding the Father’s Name

Adding a biological father’s name is not the same as adoption.

If the father is the biological parent, the issue is paternity, acknowledgment, filiation, or legitimation. Adoption applies when a person legally assumes parental status over a child who is not treated as his or her child by blood or existing legal filiation.

A stepfather, partner, or non-biological father cannot simply be placed as the father on the birth certificate unless there is a lawful basis. If he is not the biological father, the appropriate remedy may be adoption, not false entry of paternity.

Making a false statement in a civil registry document can have legal consequences.

XX. Effect on the Child’s Rights

A blank father’s name may affect the child in several practical and legal ways:

1. Surname

The child will usually use the mother’s surname unless later acknowledged by the father under RA 9255.

2. School Records

Schools may follow the birth certificate. If the father’s name is blank, school records may list only the mother or guardian unless updated documents are submitted.

3. Passport Applications

The Department of Foreign Affairs generally relies heavily on the birth certificate. A blank father’s name may require the mother’s documents and consent, especially for minors.

4. Travel Clearance

For minors traveling abroad, especially without the mother, the Department of Social Welfare and Development may require documents reflecting parental authority and consent. For illegitimate children, the mother’s authority is especially relevant.

5. Support

Support from the father may require acknowledgment or proof of paternity.

6. Inheritance

Inheritance rights from the father require legally established filiation.

7. Benefits

Claims for benefits from the father, such as insurance, employment benefits, social security-related benefits, or dependent status, may require proof of filiation.

XXI. Effect on the Mother’s Rights

When the father’s name is blank and the child is illegitimate, the mother generally has parental authority and custody.

The mother can usually make decisions regarding:

the child’s residence;
schooling;
health care;
daily care;
travel documents, subject to agency requirements;
representation of the child in legal matters.

However, the mother may still pursue support from the biological father if paternity can be established.

XXII. Effect on the Alleged Father

An alleged father whose name is blank has no automatic civil registry recognition as the father.

However, he may still face legal obligations if paternity is later established.

He may:

voluntarily acknowledge the child;
execute an affidavit of admission of paternity;
allow the child to use his surname under RA 9255;
provide support;
participate in proceedings involving paternity, support, or custody;
become legally recognized as father by court judgment.

He may also contest paternity if he believes he is not the biological father.

XXIII. False Entries and Legal Risks

The birth certificate is a public document. False statements in it may expose a person to legal consequences.

Possible legal issues may include:

falsification of public documents;
perjury, depending on the document and oath;
civil registry irregularities;
disputes over inheritance;
problems in passport, immigration, or school records;
future court challenges.

A mother, father, informant, or other person should not place a man’s name as father without lawful basis.

XXIV. Common Scenarios

Scenario 1: Unmarried Mother, Father Absent

The mother gives birth and registers the child. The father is not present and signs nothing. The father’s name is left blank. The child uses the mother’s surname.

This is the most common scenario.

Scenario 2: Father Later Acknowledges the Child

The father later executes an affidavit acknowledging the child. The birth certificate may be annotated, and the child may be allowed to use the father’s surname under RA 9255.

The child remains illegitimate unless legitimated.

Scenario 3: Father Refuses Recognition

The mother wants support, but the father refuses to acknowledge the child. The mother may need to file a legal action to establish paternity and obtain support.

Scenario 4: Parents Later Marry

The parents later marry, and the child may qualify for legitimation. The birth certificate may be updated through the legitimation process.

Scenario 5: Wrong Man Was Named as Father

This is different from a blank father’s name. Removing or changing a father’s name is usually a substantial correction requiring court action, especially because it affects filiation.

Scenario 6: Mother Was Married to Someone Else

If the mother was married when the child was conceived or born, the law may presume her husband to be the father. A blank father’s name may create serious legal complications and should be handled carefully.

XXV. Procedure to Add the Father’s Name When the Father Cooperates

Although local civil registry requirements may vary, the usual process involves:

securing a certified true copy of the child’s birth certificate;
preparing an affidavit of admission or acknowledgment of paternity;
preparing an affidavit to use the father’s surname, where applicable;
submitting valid identification documents of the parents;
filing the documents with the Local Civil Registrar where the birth was recorded;
paying applicable fees;
waiting for annotation or transmission to the Philippine Statistics Authority;
securing the updated PSA copy once processed.

The resulting PSA record may show annotations rather than a completely rewritten birth certificate.

XXVI. Procedure When the Father Does Not Cooperate

If the father refuses to acknowledge the child, the usual path is more complex:

gather evidence of paternity;
consult the proper legal remedy;
file an action for recognition, support, or compulsory acknowledgment, depending on the situation;
present evidence in court;
obtain a court judgment;
use the judgment to annotate or correct the civil registry record;
pursue support or other rights based on the established filiation.

Court action is usually necessary because the civil registrar cannot decide disputed paternity.

XXVII. DNA Testing

DNA testing may be used in paternity disputes. It can be powerful evidence, but it is not usually a stand-alone administrative shortcut for inserting a father’s name in the birth certificate.

DNA evidence is typically presented in court or in a legally recognized process.

If the alleged father refuses DNA testing, the court may evaluate the refusal together with other evidence, depending on the circumstances and applicable procedural rules.

XXVIII. Birth Certificate Annotation

When the father’s name is added later, the birth certificate may not simply be replaced as though the father had been listed from the beginning.

Instead, the civil registry record may be annotated. An annotation is a note on the civil registry document stating the legal basis for the change, such as acknowledgment, use of surname under RA 9255, legitimation, or court order.

Annotations are normal in Philippine civil registry practice.

XXIX. Blank Father’s Name and Passport Concerns

For a minor child whose father’s name is blank, passport applications usually focus on the mother’s authority and documents.

The mother may be required to submit:

the child’s PSA birth certificate;
the mother’s valid identification;
proof of parental authority;
supporting documents required by the Department of Foreign Affairs.

If the father’s name is blank, the alleged father generally has no recorded basis to sign as father unless paternity has been legally recognized.

XXX. Blank Father’s Name and DSWD Travel Clearance

For children traveling abroad, DSWD travel clearance requirements may depend on who is traveling with the child and the child’s legal status.

For an illegitimate child, the mother’s consent is usually central because the mother has parental authority. If the father’s name is blank, this may simplify some aspects of determining whose parental consent is needed, but agencies may still require supporting documents.

XXXI. Blank Father’s Name and School Records

Schools generally rely on the birth certificate. If the father’s name is blank, the school may list no father or may require supporting documentation before entering a father’s details.

If the birth certificate is later annotated, the school records may be updated upon submission of the updated PSA or civil registry copy.

XXXII. Blank Father’s Name and Baptismal Records

A baptismal certificate may name a father even if the civil birth certificate is blank. However, a baptismal record is not the same as a civil registry record.

It may be useful as evidence in some situations, but it does not automatically amend the birth certificate or legally establish paternity for all purposes.

XXXIII. Blank Father’s Name and Benefits

A child may need proof of filiation to claim benefits from the father, such as:

employment dependents’ benefits;
insurance proceeds;
social security-related benefits;
death benefits;
health maintenance organization coverage;
inheritance;
educational benefits.

A blank father’s name may make claims more difficult unless there is other proof of acknowledgment or a court judgment.

XXXIV. Rights of an Illegitimate Child

Even if the father’s name is blank, the child has rights.

The child has the right to:

a name;
care and support from the mother;
support from the father if paternity is proven;
education;
inheritance from legally recognized parents;
protection from discrimination;
identity and civil registration;
pursue recognition of filiation where allowed by law.

A blank father’s name should not be treated as a mark of lesser human dignity. It is a legal and civil registry status, not a measure of the child’s worth.

XXXV. Rights of the Child Against the Father

Once paternity is established, the child may have rights against the father, including:

support;
use of surname, if legally allowed;
inheritance as an illegitimate child;
recognition in records;
possible benefits as a dependent;
other rights flowing from filiation.

However, the scope of those rights differs depending on whether the child is legitimate, illegitimate, or legitimated.

XXXVI. Time Limits and Filiation Claims

Claims involving filiation may be subject to legal time limits, especially where the action is based on the type of evidence available and whether the alleged parent is alive or deceased.

In general, it is safer to address paternity issues early. Delays may cause evidentiary problems, especially if the alleged father dies, disappears, or becomes unavailable.

XXXVII. When the Father Is Abroad

If the father is overseas and willing to acknowledge the child, he may need to execute documents before a Philippine consulate, notary, or other authorized officer, depending on where he is and what the civil registrar requires.

Documents executed abroad may need consular acknowledgment, apostille, authentication, or other formalities depending on the country and the nature of the document.

XXXVIII. When the Father Is a Foreigner

If the father is a foreign national, the same basic principle applies: his name should not be entered without proper acknowledgment or legal basis.

Additional issues may arise, such as:

citizenship;
passport eligibility;
foreign acknowledgment documents;
immigration status;
foreign support obligations;
recognition of foreign documents;
dual citizenship concerns, depending on the father’s nationality laws.

The child’s Philippine civil registry record must still follow Philippine requirements.

XXXIX. When the Father Is Deceased

If the alleged father dies before acknowledgment, proving paternity becomes more difficult but not necessarily impossible.

Evidence may include:

written admissions;
signed letters;
messages;
public documents;
support records;
photographs;
family recognition;
testimony;
DNA testing involving relatives, where allowed and relevant;
estate records.

Claims may become entangled with inheritance proceedings, settlement of estate, and opposition from heirs.

XL. When the Child Is Already an Adult

An adult whose birth certificate has a blank father’s name may still seek recognition or correction, depending on the legal basis and evidence available.

An adult may pursue:

acknowledgment by the father if he is willing;
use of father’s surname under proper procedures;
legitimation records, if applicable;
judicial recognition of filiation;
correction or annotation of civil registry records.

The feasibility depends heavily on the facts, evidence, and whether the alleged father is alive.

XLI. Difference Between Acknowledgment, Recognition, and Legitimation

These terms are related but distinct.

Acknowledgment or Recognition

This means the father admits that the child is his. It establishes or helps prove filiation. For an illegitimate child, it may allow the child to use the father’s surname and claim support or inheritance rights.

Legitimation

This changes the child’s legal status from illegitimate to legitimate when the legal requirements are met, usually through the subsequent valid marriage of the parents.

Adoption

This creates a legal parent-child relationship through adoption proceedings. It is not the same as biological acknowledgment.

XLII. Can a Blank Father’s Name Be Beneficial?

In some situations, a blank father’s name may avoid future complications, especially where the alleged father is absent, abusive, unwilling, unknown, or not legally established.

For an illegitimate child, the mother’s sole parental authority may make decisions clearer for school, travel, custody, and daily care.

However, the blank entry may also create difficulties in claiming support, inheritance, benefits, and identity-related rights from the father.

XLIII. Common Misconceptions

Misconception 1: A blank father’s name means the child has no father.

Legally, it means no father is recorded. Biologically, every child has a father.

Misconception 2: The mother can simply add the father’s name anytime.

Not without proper acknowledgment, legal proof, or court order.

Misconception 3: DNA test alone automatically changes the birth certificate.

DNA evidence may support a legal case, but the civil registrar usually requires proper legal documentation or court judgment.

Misconception 4: Using the father’s surname makes the child legitimate.

No. Use of the father’s surname under RA 9255 does not by itself make the child legitimate.

Misconception 5: Once the father acknowledges the child, he automatically gets custody.

No. For illegitimate children, the mother generally has parental authority, although support and other rights may arise.

Misconception 6: A baptismal certificate can replace a birth certificate.

No. A baptismal certificate may be supporting evidence but does not replace civil registration.

XLIV. Practical Documents Usually Needed

Depending on the remedy, these documents may be relevant:

PSA Certificate of Live Birth;
Local Civil Registrar copy of the birth record;
mother’s valid ID;
father’s valid ID;
affidavit of admission of paternity;
affidavit to use the surname of the father;
parents’ marriage certificate, if legitimation is involved;
certificate of no marriage, where relevant;
court order, if required;
DNA test results, if part of litigation;
proof of support;
written communications;
photographs and records showing relationship;
school, medical, or baptismal records.

Requirements vary depending on the Local Civil Registrar, PSA rules, and the legal remedy pursued.

XLV. Legal Remedies Summary

Situation	Usual Remedy
Father is blank because unmarried father did not acknowledge child	Father may execute acknowledgment documents
Father wants child to use his surname	RA 9255 process, if requirements are met
Father refuses to acknowledge child	Court action to establish paternity/filiation
Parents later marry	Legitimation, if legally qualified
Blank entry caused by clerical omission despite existing acknowledgment	Administrative or judicial correction depending on facts
Mother was married to another man	Legal advice and possibly court action due to presumption of legitimacy
Non-biological person wants to be listed as father	Adoption or other lawful process, not false birth entry
Father is deceased	Judicial action may be needed, with available evidence

XLVI. Key Legal Principles

The following principles generally govern blank father’s name issues in the Philippines:

A birth certificate is a public document.
Paternity cannot be inserted without legal basis.
An illegitimate child generally uses the mother’s surname.
The father’s surname may be used if the father expressly recognizes the child.
Recognition does not automatically make the child legitimate.
Legitimation requires compliance with specific legal requirements.
The mother generally has parental authority over an illegitimate child.
Support may be demanded from the father once paternity is established.
Inheritance rights depend on legally recognized filiation.
Disputed paternity is for the courts, not the civil registrar, to decide.
False entries in civil registry documents can have serious consequences.
Civil registry changes affecting filiation are usually substantial, not merely clerical.

XLVII. Conclusion

A blank father’s name on a child’s Philippine birth certificate is legally significant. It usually means that no father has been legally acknowledged or recorded at the time of birth registration. For a child born outside marriage, the practical result is that the child ordinarily uses the mother’s surname, and the mother generally exercises parental authority.

The blank entry does not prevent later recognition, support, surname use, inheritance claims, or legitimation, but those rights usually require proper legal steps. If the father cooperates, acknowledgment and civil registry annotation may be possible. If the father refuses, a court action may be necessary. If the parents later marry, legitimation may be available if the legal requirements are met.

The central rule is simple: in Philippine civil registry law, a father’s name cannot be added casually or informally. Because paternity affects identity, support, custody, succession, and civil status, the law requires valid acknowledgment, sufficient proof, or a court order.