Short answer. Yes. An illegitimate child must prove filiation before being entitled to any share of the estate. The statute is explicit: in all cases of illegitimate children, their filiation must be duly proved. A claim alone is not enough — evidence establishing parentage is required before the estate can be distributed.
What the law says
In all cases of illegitimate children, their filiation must be duly proved.
Civil Code, Article 887 — Who the Compulsory Heirs Are. Read the full provision →
Filiation is not automatic — it must be established
The law requires that an illegitimate child prove parentage before receiving any share of the estate. A claim, an assertion, or even a physical resemblance is not sufficient. Duly proved means through legally recognized evidence — which may include a birth certificate bearing the father's acknowledgment, a public document, a private handwritten instrument signed by the parent, or other competent evidence under the applicable rules. The burden falls on the claiming child, not on the estate or on the legitimate heirs to disprove the claim.
How the current Family Code changes the categories — but not the proof requirement
The Civil Code originally divided illegitimate children into several classes, some with higher shares than others. The Family Code abolished those distinctions. Today there is only one class of illegitimate child, and each illegitimate child receives a fixed share regardless of which old category they might once have fallen under. What the Family Code did not change is the proof requirement. The rule that filiation must be duly proved before an illegitimate child participates in the estate remains in place.
What the share looks like today
Under the Family Code, each illegitimate child's legitime is one-half the legitime of a legitimate child. If your father had legitimate children, the illegitimate child's portion is calculated based on what each legitimate child would receive — then halved. This share is protected as a legitime, meaning the will cannot take it away. But the illegitimate child cannot claim it — or any voluntary bequest — unless filiation is established first. Distribution of an estate before filiation is resolved risks a later challenge.
What to do if filiation is disputed
If the other heirs dispute whether the claimant is in fact your father's child, the issue must be resolved before the estate is settled. A court proceeding may be necessary to determine parentage, and the outcome will affect how the estate is divided. DNA evidence, documentary records, and testimony can all be relevant. It is advisable not to proceed with final distribution until filiation is either admitted or adjudicated — distributing the estate prematurely can create liability for the administrators and complicate later corrections.
Cases citing this provision
These Supreme Court decisions cite the provision above. We list them so you can read them yourself; the summaries of what each decided are not ours to give.
- Amadea Angela K. Aquino vs. Rodolfo C. Aquino and Abdulah C. Aquino/Rodolfo C. Aquino, G.R. No. 208912 / G.R. No. 209018, December 7, 2021 — read the decision on LawPhil →
- Martin Roberto G. Tirol vs. Sol Nolasco, G.R. No. 230103, August 27, 2020 — read the decision on LawPhil →
- Ingrid V. Hilario vs. Thelma Miranda and Irenea Belloc, G.R. No. 196499, November 28, 2018 — read the decision on LawPhil →
- Elenita V. Macalinao, Kenneth V. Macalinao and Kristel V. Macalinao vs. Cerina, A.K.A. Cerena N. Macalinao and Cindy N. Ma, G.R. No. 250613, April 3, 2024 — read the decision on LawPhil →