In the Philippines, the status of a child is primarily determined by the marital status of the parents at the time of the child’s conception or birth. When a child is born to parents who are not legally married, that child is classified as "illegitimate." However, Philippine law provides a specific legal remedy known as legitimation, which allows a child born out of wedlock to attain the same legal status and rights as a legitimate child upon the subsequent valid marriage of the parents.

I. Legal Basis and Definition of Legitimation

Legitimation is a "legal fiction" created by the Family Code of the Philippines (Articles 177 to 182) and expanded by Republic Act No. 9858. It is the process by which a child who was born outside of a valid marriage is considered legitimate as if they had been born to married parents, provided specific legal conditions are met.

The "No Legal Impediment" Rule

Under Article 177 of the Family Code, only children conceived and born outside of wedlock to parents who, at the time of the child's conception, were not disqualified by any legal impediment to marry each other, may be legitimated.

Common legal impediments include:

An existing prior marriage (Bigamy).
Being within the prohibited degrees of relationship (Incest).

Expansion under RA 9858

Previously, if parents were too young to marry (under 18) at the time of conception, the child could not be legitimated. Republic Act No. 9858 amended this, allowing legitimation even if the parents were disqualified from marrying at the time of conception solely because they were below the legal marrying age.

II. The Essential Role of the CENOMAR

The Certificate of No Marriage Record (CENOMAR) is a pivotal document in the legitimation process. Issued by the Philippine Statistics Authority (PSA), it certifies whether a person has a recorded marriage in the national archives.

Why is CENOMAR required for legitimation?

While a Marriage Certificate proves the parents are now married, the CENOMAR serves as evidence of the parents' status at the time of the child's conception. To qualify for legitimation, the parents must prove there were no "legal impediments" when the child was conceived. If either parent was already married to someone else at that time, legitimation is legally impossible under current Philippine statutes, even if the parents eventually marry each other later (unless the previous marriage was declared void ab initio).

The Local Civil Registrar (LCR) requires the CENOMAR of both parents to verify that the subsequent marriage is valid and that the child qualifies for the "legal fiction" of legitimacy.

III. Documentary Requirements for Legitimation

For married couples seeking to legitimate a child born before their union, the following documents must be submitted to the Local Civil Registrar (LCR) where the child’s birth was originally registered:

PSA Birth Certificate of the Child: An original copy of the child’s Certificate of Live Birth (COLB).
PSA Marriage Certificate of the Parents: To prove the "subsequent valid marriage."
CENOMAR of Both Parents: To prove the absence of legal impediments at the time of the child's conception.
Joint Affidavit of Legitimation: A sworn statement executed by both parents, notarized by a notary public, which must include:
- The names of the parents.
- Statement that at the time of the child's conception, no legal impediment existed for them to marry (or the only impediment was age).
- Details of the subsequent marriage (date, place, and solemnizing officer).
Affidavit of Admission of Paternity: Required if the father did not sign the original birth certificate or if the child was registered only under the mother's name.
Valid Government-Issued IDs: Of both parents.
Consent of the Child: If the child is already 18 years old or older, they must provide a written instrument or affidavit expressing their consent to be legitimated.

IV. The Step-by-Step Procedure

The process is administrative and does not usually require a court order, provided the requirements are met.

Preparation of Documents: Secure the PSA copies of the birth certificate, marriage contract, and CENOMARs.
Execution of Affidavit: The parents execute the Joint Affidavit of Legitimation. If the child is born abroad, this must be done at the nearest Philippine Consulate.
Filing at the LCR: Submit the documents to the LCR of the city or municipality where the birth was recorded.
Payment of Fees: Pay the corresponding administrative and registration fees (these vary by municipality).
Registration and Annotation: The LCR will review the documents. If approved, the LCR will register the Affidavit of Legitimation in the Registry of Legal Instruments.
Annotation of Birth Certificate: The LCR will annotate the original birth certificate with a remark such as: "Legitimated by subsequent marriage of parents on [Date] at [Place] under Registry No. [Number]."
PSA Endorsement: The LCR sends the annotated record to the PSA. After a few months, the parents can request a new PSA Birth Certificate that reflects the legitimation.

V. Legal Effects and Rights

Once the legitimation process is complete, the effects retroact to the time of the child’s birth. The legitimated child gains the following rights:

Surname: The right to use the father's surname.
Succession: The right to inherit from the parents as a compulsory heir, with the same "legitime" (inheritance share) as a child born within a marriage.
Support: The right to receive legal support from both parents.
Parental Authority: The parents exercise joint parental authority over the child.

Important Note on Revocation

Legitimation may be impugned (challenged) only by those who are prejudiced in their rights (such as other legal heirs), and only within five years from the time the legitimation was registered in the civil register.

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