In Philippine law, common-law partnerships—also referred to as cohabitation or live-in relationships without the benefit of marriage—do not confer the same rights as valid civil or religious marriages. Nevertheless, children born to such partners enjoy specific protections under the Family Code of the Philippines (Executive Order No. 209, as amended) and the Civil Code of the Philippines. These protections center on two core rights: the right to support during the lifetime of the parents and the right to inheritance upon the death of either or both parents. The legal framework treats these children as illegitimate (natural children) but accords them compulsory-heir status and enforceable claims for sustenance and succession. This article comprehensively examines the governing statutes, the establishment of filiation, the scope of support obligations, inheritance rules, property relations in the partnership, procedural remedies, special circumstances, and relevant principles derived from the law.

Definition and Legal Status of Common-Law Partnerships

A common-law partnership exists when a man and a woman, capacitated or otherwise, live together as husband and wife without contracting marriage. The Family Code does not recognize “common-law marriage” as a valid marital regime. Instead, it regulates property relations through Articles 147 and 148.

Under Article 147, when the parties are both capacitated to marry (neither is legally married to another person and they are not related within prohibited degrees), all property acquired during cohabitation through their work, industry, or salary belongs to them in equal shares as co-owners. Wages, salaries, and fruits of separate property are likewise co-owned. Upon dissolution by death or separation, each party retains his or her share, subject to the claims of compulsory heirs.

Under Article 148, when one or both parties are incapacitated (e.g., one is still legally married), only properties acquired through the actual joint contribution of money, property, or industry are co-owned in proportion to the contributions. Earnings from separate property remain separate, and any forfeiture rules apply in cases of bad faith.

These property rules are crucial because children derive inheritance rights from the estate of each parent, including the parent’s share in the co-owned assets.

Status of Children Born to Common-Law Partners

Children conceived and born outside a valid marriage are classified as illegitimate children under Article 163 of the Family Code. They are not legitimate because legitimacy requires conception and birth during a valid marriage (Article 164). However, illegitimacy does not deprive them of parental rights or obligations. The law expressly grants illegitimate children the same rights to support and inheritance as legitimate children, albeit with differences in the quantum of inheritance shares.

Parental authority over illegitimate children is exercised jointly by both parents if they acknowledge the child. In the absence of acknowledgment, the mother exercises sole parental authority (Article 176, as amended by Republic Act No. 9255).

Establishment of Filiation: The Prerequisite for All Rights

No right to support or inheritance arises unless filiation is established. Filiation may be proven by:

Voluntary acknowledgment – The father or mother executes a public document (affidavit of acknowledgment), records the child in the civil registry, or includes the child in a will.
Birth certificate – If the child’s birth record shows the name of the father with his consent or signature, this constitutes prima facie proof.
Court action for recognition – An action to compel recognition may be filed by the child (or mother on the child’s behalf) while the putative parent is alive, or by the child’s heirs after the parent’s death (within the prescriptive period).
DNA evidence – Modern jurisprudence accepts DNA testing as conclusive proof when other evidence is unavailable, provided proper chain of custody is observed.
Other evidence – Continuous possession of the child’s status as the offspring, open and public acknowledgment, or any other proof allowed under the Rules of Court.

Once filiation is established, the child acquires full rights as an illegitimate child. If the parents later marry, the child may be legitimated under Articles 177–182, elevating his or her status to legitimate with full inheritance parity.

Right to Support

The obligation to support is a personal, natural, and legal duty of both parents, regardless of the marital status of the relationship (Articles 194–208, Family Code). Support includes everything indispensable for sustenance, dwelling, clothing, medical attendance, education, and transportation, in keeping with the family’s social and financial position.

Key principles:

The obligation is joint and several; either parent may be compelled to provide full support.
Support is demandable from the time the child is conceived (in utero support is limited but recognized in practice).
The amount is determined by the child’s needs and the parents’ means. Courts consider the child’s age, health, educational requirements, and the parents’ income and assets.
Duration: Support continues until the child reaches 18 years of age or completes college education, whichever comes later, or until the child becomes self-supporting. Emancipation does not automatically terminate support if the child is still in school.
Enforcement: An action for support may be filed before the Family Court. Provisional support may be granted pendente lite. Failure to comply may result in contempt, attachment of property, or criminal liability under Republic Act No. 9262 (Anti-Violence Against Women and Their Children Act) if the refusal endangers the child.
After the death of one parent, the surviving parent remains solely liable. The obligation does not pass to the deceased parent’s estate except through inheritance already received by the child.

Support claims are imprescriptible while the child is a minor.

Right to Inheritance

Illegitimate children are compulsory heirs under Article 887 of the Civil Code. They are entitled to a legitime (reserved portion) of the parent’s estate.

In intestate succession (no will):

If the deceased parent leaves only illegitimate children and no legitimate children, the illegitimate children divide the entire estate equally (Article 983).
If legitimate children also exist (from another relationship), each illegitimate child receives one-half the share of each legitimate child (Article 983 in relation to Article 895).
The surviving common-law partner has no spousal inheritance rights; only the children (and other compulsory heirs such as parents or ascendants if no descendants) inherit.

In testate succession (with a will):

The testator may freely dispose of the free portion (one-half of the estate if there are compulsory heirs).
The legitime of illegitimate children cannot be impaired. Their legitime is one-half of the legitime of a legitimate child (Article 895). For example, if the legitime for legitimate children is one-half of the estate divided equally, each illegitimate child receives one-fourth of that amount per legitimate child.
Disinheritance is strictly regulated and requires a valid cause stated in the will (Articles 916–919).

Preterition (omission of a compulsory heir in the will) results in annulment of the institution of heirs, but legacies and devises remain valid up to the free portion.

The estate includes the deceased parent’s share in the co-owned properties under Articles 147 or 148. Thus, children may claim not only personal assets but also one-half (or proportional) interest in partnership-acquired property.

Prescriptive period for claiming inheritance: Ten years from the death of the parent for actions to recover the share (Article 1144, Civil Code), or thirty years for real property in some contexts.

Property Relations and Children’s Claims on Partnership Assets

Because common-law partners hold property in co-ownership, the death of one partner triggers liquidation of the co-owned assets. The deceased partner’s share forms part of his or her estate and passes to the compulsory heirs—including the illegitimate children—according to the rules above. The surviving partner retains only his or her own share and has no further claim against the estate unless proven contributions exceed the legal presumption.

Children may participate in the partition of the co-owned property through their inheritance rights. Courts apply the rules on co-ownership (Articles 484–518, Civil Code) simultaneously with succession rules.

Procedural Remedies and Special Circumstances

Support actions – Filed in the Family Court of the child’s residence. Summary procedure applies in many cases.
Recognition and inheritance actions – An action to establish filiation combined with a petition for support or for settlement of estate. Probate proceedings (testate or intestate) in the Regional Trial Court allow the child to file a claim as compulsory heir.
DNA testing – Ordered by the court upon motion; refusal to submit may give rise to adverse presumption.
Special cases:
- If one partner is legally married to another person, the children remain illegitimate and retain full rights against their biological parent. However, the incapacitated partner’s share in property is governed by Article 148, and the legitimate spouse of the married partner may assert claims.
- If the common-law partner dies leaving minor children, guardianship proceedings may be initiated for management of inherited property.
- Pension or death benefits under the Social Security System, Government Service Insurance System, or private insurance may be claimed by acknowledged illegitimate children as primary beneficiaries.
- Republic Act No. 9255 allows illegitimate children to use the father’s surname upon acknowledgment, facilitating documentation for inheritance and support claims.

Governing Statutes and Overarching Principles

The primary sources are:

Family Code of the Philippines (Articles 147–148 on property; 163–182 on filiation and legitimacy; 194–208 on support; 209–233 on parental authority).
Civil Code of the Philippines (Articles 774–1105 on succession; 484–518 on co-ownership).
Rules of Court (Rule 103 on change of name/surname; Rule 69 on partition).
Republic Act No. 9255 (illegitimate children’s surname).
Republic Act No. 9262 (protection and support enforcement).

Philippine law consistently upholds the best interest of the child (Article 3, Child and Youth Welfare Code; Article 211, Family Code). Public policy favors recognition of filiation and enforcement of parental obligations to prevent destitution of children born outside marriage. Courts liberally construe evidence of filiation and strictly protect legitimes.

All rights—support and inheritance—attach automatically once filiation is proven. Common-law partners cannot contract away these rights by private agreement. Any waiver by the child (once of legal age) must be made with full knowledge and in proper legal form.

This framework ensures that children of common-law partners, though born outside wedlock, are not left without legal recourse for sustenance during life and equitable participation in their parents’ estates upon death. The law balances respect for the institution of marriage with the imperative to safeguard the welfare and property interests of all Filipino children.