Paternity, Acknowledgment, and Surnames (Demo)

What is “Paternity” in Philippine Law?

“Paternity” refers to the legal (or biological) relationship between a child and his or her father. In law, establishing paternity is important because it affects:

• The child’s right to support (the father may be legally obligated to provide for the child)
• The child’s right to inherit (share in the father’s estate)
• The child’s right to bear the father’s name (in certain cases)
• Other civil status rights (e.g. legitimacy, rights of filiation)

The Supreme Court has reaffirmed though the law may fix legal status, it cannot change real blood connections. Establishing paternity or acknowledgment does not always make an “illegitimate” child automatically “legitimate.” 

In the case of Ordona v. Local Civil Registrar of Pasig City¹. The Supreme Court noted that even when a child uses the father’s surname, this does not transfer parental authority from the mother to the father. In other words, using the surname doesn’t change who has custodial or decision-making rights. 

Legal Basis

• Republic Act No. 9255 is the key statute. It amended Article 176 of the Family Code to allow an “illegitimate child” (a child born out of marriage) to use the father’s surname, provided the father acknowledges the child via certain instruments². 
• The Family Code itself already contains provisions on legitimation, filiation, parental authority, etc³.
• The Supreme Court has interpreted how acknowledgment and recognition should work in practice.

Modes of Acknowledgment / Recognition

The law and practice provide several possible documents by which a father may “recognize” or “acknowledge” a child born out of wedlock. Common forms include:

1. Entry at the back of the Certificate of Live Birth (COLB) — the father signs at the back of the child’s birth certificate recognizing filiation⁴.
2. Notarial instrument, e.g. Affidavit of Admission (or Acknowledgment) of Paternity (AAP) — a formal document made before a notary public.
3. Private handwritten instrument (PHI) — the father writes by hand a statement that he recognizes the child (less formal, but valid if properly done).
4. Affidavit to Use the Surname of the Father (AUSF) — this is a separate (but related) instrument needed when the child wants to use the father’s surname under RA 9255⁵.

Who must sign, depending on child’s age

One important detail: the law and implementing rules require different signatories depending on the age of the child⁶:

• If the child is 0–6 years old, the mother (or legal guardian) must sign the AUSF (on behalf of the child). 
• If the child is 7 to 17 years old, both the mother (or guardian) and the child must sign the AUSF, provided the child understands the implications. 
• If the child is 18 years or older, the child may sign on their own.

These rules ensure that the child’s consent and understanding are respected, especially as they grow up.

Effects of Acknowledgment

Once a valid acknowledgment is accepted and registered, it may:

• Provide prima facie evidence of filiation (i.e., at first glance, it is proof unless disproved).
• Give the child the right to use the father’s surname, through annotation of the birth record. (Under RA 9255)⁷.
• Support claims to support, inheritance, and other civil rights (subject to legal processes)⁸.

Default Rule: Maternal Surnmae

By default, children born out of wedlock carry the mother’s surname. This is the baseline under the Family Code (Article 176) as amended⁹. Unless and until the father properly acknowledges paternity and the legal formalities are followed, the child’s surname remains the mother’s.

Can the Surname Change Be Reversed or Altered Later?

Yes, but not without going back to court. Once a surname change is accepted and annotated under RA 9255, reversing it is not just a clerical matter. 

1. Ordona v. Local Civil Registrar of Pasig City, G.R. No. 215370, November 9, 2021. ↩︎
2. Republic Act No. (2004). ↩︎
3. Family Code of the Philippines (1987). ↩︎
4. PSA Office of the Civil Registrar General, Administrative Order No. 1, Series of 2004. ↩︎
5. PSA Guidelines on the Implementation of RA 9255, Rule 7. ↩︎
6. Revised Implementing Rules And Regulations Of Republic Act No. 9255, Administrative Order No. 1, Series of 2016 ↩︎
7.  RA 9255, Sec. 1. ↩︎
8. Civil Code, Arts. 887 & 887-A (succession). ↩︎
9. Family Code, Art. 176 (as amended). ↩︎

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