Under Philippine law, a child born to parents who were not yet married to each other can become legally 'legitimated' if those same parents later marry — instantly gaining the same rights as a child born within marriage. This process, primarily governed by the Family Code and expanded by Republic Act 9858, is simpler than many parents assume, since it doesn't require a court case in most situations. Here's how legitimation works and how to formally record it with the civil registry.
This guide covers Step 1: Understand What Legitimation Means Legally and Step 2: Check If Your Child Qualifies Under the Family Code and RA 9858, with the full details below.
- Legitimation happens automatically by law when the child's parents later marry each other, if there was no legal impediment at conception
- RA 9858 extended legitimation to children of parents who were below marrying age (minors) at the time of conception
- You must file an Affidavit of Legitimation with the Local Civil Registrar after the parents' marriage
- The child's birth certificate gets annotated to reflect legitimate status and, if desired, the father's surname
- A legitimated child gains the same successional and support rights as a child born within marriage
Step 1: Understand What Legitimation Means Legally
Legitimation is the legal process by which a child conceived and born outside of marriage becomes considered legitimate — meaning legally equal to a child born to married parents — because the child's biological parents later marry each other. Once legitimation takes effect, it applies retroactively to the child's birth, as if the child had been legitimate from the moment they were born.
Step 2: Check If Your Child Qualifies Under the Family Code and RA 9858
Under the original Family Code, legitimation required that at the time the child was conceived, the parents had no legal impediment to marry each other (for example, neither was already married to someone else). Republic Act 9858 expanded this rule specifically for cases where the only impediment was that one or both parents were below the legal marrying age (minors) at the time of conception — those children can now also be legitimated once their parents later marry, as long as there was no other impediment like an existing marriage to someone else.
Step 3: Confirm the Parents Have a Valid Subsequent Marriage
Legitimation only takes effect once the child's biological parents contract a valid marriage with each other. This means both parents must be legally free to marry (no existing marriage to another person) at the time of their wedding to each other. Legitimation cannot happen if one parent marries someone other than the child's other biological parent — the marriage must specifically be between the child's two parents.
Step 4: Gather the Required Documents
- The child's original PSA birth certificate showing the child was born prior to the parents' marriage
- The parents' PSA marriage certificate
- Valid government-issued IDs of both parents
- Affidavit of Legitimation (available at the Local Civil Registry Office) signed by both parents
- If applicable, an Affidavit to Use the Surname of the Father (AUSF), if the child will now use the father's surname
Step 5: File the Affidavit of Legitimation with the Local Civil Registrar
Both parents (or their authorized representative, in specific cases) file the Affidavit of Legitimation at the Local Civil Registry Office (LCRO) where the child's birth was originally registered. You can find general guidance on civil registry procedures through the PSA's civil registration page. The LCRO reviews the documents to confirm the marriage date, the child's birth date, and that no legal impediment existed (aside from minority age, if RA 9858 applies).
Step 6: Wait for the Birth Certificate Annotation
Once approved, the LCRO annotates the child's birth certificate to reflect the legitimation, including the parents' marriage details and, if applicable, the child's updated surname. This annotated record is then transmitted to the PSA, which typically takes a few weeks to a few months before you can request an updated, PSA-certified annotated copy.
Step 7: Update the Child's Other Records
Once you have the annotated PSA birth certificate showing legitimation, use it to update the child's school enrollment records, PhilHealth dependent registration, and any other documents that reference their civil status or surname, so all records remain consistent going forward.
Step 8: Know What Legitimation Changes for the Child
A legitimated child gains the same rights as a legitimate child, including the right to use the father's surname, full successional (inheritance) rights equal to any legitimate siblings, and the right to receive support from both parents under the same standards applied to legitimate children — a significant legal upgrade from the more limited rights of a child born outside marriage without legitimation.
Frequently Asked Questions
While legitimation technically takes effect by operation of law once the parents validly marry, you still need to file an Affidavit of Legitimation with the Local Civil Registrar to have this reflected and annotated on the child's official birth certificate — without this filing, the child's PSA record won't show the updated legitimate status.
RA 9858 expanded the Family Code's legitimation rules to cover children whose parents were below the legal marrying age (minors) at the time of conception, allowing those children to still be legitimated once their parents later marry, as long as there was no other legal impediment like an existing marriage to someone else.
No. If either parent had an existing valid marriage to a different person at the time the child was conceived, that constitutes a legal impediment that legitimation cannot cure, even if that other marriage later ends and the biological parents eventually marry each other.
Not automatically in every case — depending on the LCRO's specific process, an Affidavit to Use the Surname of the Father (AUSF) may need to be filed alongside the legitimation documents for the child's surname to be formally updated on their annotated birth certificate.
After the Local Civil Registrar approves the Affidavit of Legitimation, it typically takes a few weeks to a few months for the annotation to be transmitted to and processed by the PSA before you can request an updated, PSA-certified annotated copy showing the legitimated status.
Yes. Once legitimated, a child gains full successional rights equal to any legitimate children of the same parents, meaning they inherit under the same legal share and priority as if they had been born within the marriage from the start.
No, these are entirely different legal processes. Legitimation applies specifically to a biological child of parents who later marry each other, automatically upgrading the child's civil status, while adoption creates a legal parent-child relationship between a child and adoptive parents who are not necessarily the child's biological parents.
Conclusion
Legitimation gives children born outside marriage the same legal standing as children born within it, simply by virtue of their parents later marrying — a meaningful benefit that many Filipino families aren't fully aware they're entitled to record. If your situation qualifies, filing the Affidavit of Legitimation at your Local Civil Registry Office is a relatively straightforward way to secure your child's full legal rights going forward.
