Illegitimate Child Inheritance Rights in the Philippines

Yes. In the Philippines, an illegitimate child is a compulsory heir of their own father or mother. Once filiation is proved, the child’s legitime is one-half of a legitimate child’s legitime (Family Code Art. 176). If there is no will, the child also takes an intestate share. The hard questions are proof of filiation and inheriting from the parent’s relatives.

At a glance

Rule: Each illegitimate child’s legitime is one-half of the legitime of a legitimate child (Family Code Art. 176, a rule kept word for word when Republic Act 9255 amended the article in 2004).
Condition: “In all cases of illegitimate children, their filiation must be duly proved” (Civil Code Art. 887).
Biggest trap: If you must rely on open and continuous possession of status, DNA or other secondary evidence, the action to prove filiation must be brought while the alleged parent is alive (Family Code Art. 175).
Grandparents: Since Aquino v. Aquino (2021), a nonmarital grandchild may represent a deceased parent in a grandparent’s estate. Inheriting from brothers, sisters and other collateral relatives across the legitimate–illegitimate line is still barred by Art. 992.
Next step: Get a PSA copy of your birth certificate and collect every written acknowledgment by the parent before anything else.

Is an illegitimate child a compulsory heir?

Yes. Civil Code Article 887 lists illegitimate children among the compulsory heirs and states that they are not excluded by legitimate children or legitimate parents. A parent cannot leave an illegitimate child out of a will entirely or give them less than their legitime, unless the child is validly disinherited for a legal cause.

Article 887 still uses the old categories (“acknowledged natural children,” “natural children by legal fiction” and “other illegitimate children”), and Article 895 still gives the old fractions for each, including four-fifths for “spurious” children. Do not compute shares from those lines. The Family Code, effective August 3, 1988, treats all children born outside a valid marriage as one class (Art. 165) and sets one legitime for each of them in Article 176, while keeping the rest of the Civil Code’s succession rules in force.

How much does an illegitimate child inherit?

The answer depends on whether the parent left a will and on who else survives. With a will, the child is guaranteed at least the legitime. Without a will, the child takes an intestate share fixed by the Civil Code. The table below shows the main combinations; worked examples are in how inheritance is divided in the Philippines, and the full order of intestate heirs is in who inherits when someone dies without a will.

Who survives the parent	Legitime (with a will)	Intestate share (no will)
Illegitimate children only	One-half of the estate, shared among them (Art. 901)	The entire estate (Art. 988)
Illegitimate and legitimate children	Each illegitimate child gets one-half of one legitimate child’s legitime (FC Art. 176)	Shares follow the same one-to-two proportion (Art. 983, read with FC Art. 176)
Illegitimate children and legitimate parents	One-fourth of the estate for the illegitimate children (Art. 896)	One-half for the illegitimate children, one-half for the ascendants (Art. 991)
Illegitimate children and surviving spouse	One-third each for the spouse and the children (Art. 894)	One-half for the spouse, one-half for the children (Art. 998)
Illegitimate children, spouse and legitimate parents	One-fourth for the children, one-eighth for the spouse (Art. 899)	Ascendants one-half, spouse one-fourth, children one-fourth (Art. 1000)

One limit matters when there are many illegitimate children alongside legitimate ones: their legitimes come out of the free portion, the surviving spouse’s legitime is satisfied first, and the total for the illegitimate children cannot exceed that free portion (Art. 895, third paragraph). In a large family this can reduce each illegitimate child’s share below the simple one-half ratio, so have the computation checked.

How do you prove you are the parent’s illegitimate child?

Under Family Code Article 175, illegitimate children prove filiation “in the same way and on the same evidence as legitimate children,” using the two-tier list in Article 172. Use the first tier whenever you can.

Evidence	Tier	Deadline to sue
Record of birth in the civil register, or a final judgment	Primary (Art. 172, first paragraph)	During the child’s lifetime (Art. 173, via Art. 175)
Admission in a public document or signed private handwritten instrument	Primary (Art. 172, first paragraph)	During the child’s lifetime (Art. 173, via Art. 175)
Open and continuous possession of the status of a child	Secondary (Art. 172, second paragraph)	Only during the lifetime of the alleged parent (Art. 175)
Any other means allowed by the Rules of Court, such as DNA evidence	Secondary (Art. 172, second paragraph)	Only during the lifetime of the alleged parent (Art. 175)

The lifetime limit has real consequences. In Uyguangco v. Court of Appeals (G.R. No. 76873, October 26, 1989), a man who had no birth record or written admission from his late father tried to prove filiation inside a partition case. The Supreme Court dismissed the case: an action resting on the second paragraph of Article 172 must be brought during the alleged parent’s lifetime, and filing a partition suit does not get around that rule.

A birth certificate helps most when the parent signed it or acknowledged the child in it. A record that is silent about the father, or that the father never signed, is weaker evidence of paternity. Questions about changing a surname, correcting a birth record or a contested paternity case belong to family law and the civil registry; this guide covers only what filiation means for inheritance.

Can an illegitimate child inherit from grandparents, siblings or other relatives?

Civil Code Article 992 says: “An illegitimate child has no right to inherit ab intestato from the legitimate children and relatives of his father or mother; nor shall such children or relatives inherit in the same manner from the illegitimate child.” Courts call this the “iron curtain” rule. It applies only when there is no will; a person can always leave property by will to anyone within the free portion.

Old reading (grandparents): In Diaz v. Intermediate Appellate Court (G.R. No. 66574, February 21, 1990), the Court barred the illegitimate children of a legitimate son from inheriting from their grandmother, reasoning that the law presumes “an intervening antagonism and incompatibility” between the legitimate and illegitimate families.
Current rule (grandparents and other direct ascendants): In Aquino v. Aquino (G.R. Nos. 208912 and 209018, December 7, 2021, En Banc), the Court adopted “a construction of Article 992 that makes children, regardless of the circumstances of their births, qualified to inherit from their direct ascendants such as their grandparent by their right of representation.” The child still has to prove filiation; the case itself was sent back to the trial court to decide that, including through DNA evidence.
Brothers, sisters and other collateral relatives: The bar still applies. In Manuel v. Ferrer (G.R. No. 117246, August 21, 1995), the legitimate children of a father could not inherit intestate from their illegitimate half-brother. Aquino said expressly that it was not ruling on collateral relatives.
The illegitimate child’s own descendants: Separate from Article 992, the Civil Code lets the descendants of a deceased illegitimate child, legitimate or illegitimate, take that child’s place in the illegitimate parent’s estate (Arts. 902, 989 and 990).

For how representation works in general, see when grandchildren inherit by representation.

What if the other heirs settle the estate without you?

Heirs who sign an extrajudicial settlement without you cannot bind you. Rule 74, Section 1 of the Rules of Court states that “no extrajudicial settlement shall be binding upon any person who has not participated therein or had no notice thereof.” Section 4 lets an heir unduly deprived of their share compel settlement in court within two years after the settlement and distribution, and remedies such as reconveyance and partition may still be open after that, depending on the facts. In Treyes v. Larlar (G.R. No. 232579, September 8, 2020, En Banc), the Supreme Court held that an heir does not need a prior, separate judicial declaration of heirship before filing an ordinary civil action to protect rights acquired by succession, unless a special proceeding to settle the estate or determine heirs is already pending.

Expect the other heirs to raise two defenses: that your filiation is unproved, and that your action is out of time. Answer the first with first-tier documents. For the second, compare the date of the settlement and any title transfer with the periods discussed in what an heir left out of an estate settlement can do.

Your options and what to do next

First action this week: request a PSA copy of your birth certificate and check whether the parent signed or acknowledged it. Then pick the route that fits your situation.

Parent is still alive and filiation is not documented. Ask the parent to sign an acknowledgment in a public document, such as a notarized affidavit, or to acknowledge you in the birth record. If the parent refuses and you have only secondary evidence, consult a lawyer about an action to establish filiation now; the Article 175 lifetime limit means waiting can end the claim.
Parent has died and the heirs are cooperating. Join the extrajudicial settlement as an heir. Bring your PSA birth certificate, any written acknowledgment, the parent’s death certificate, titles or tax declarations, and IDs. Check that the deed lists you and gives at least your legitime.
Parent has died and you were left out. Send a written demand to the other heirs asking to be included, attaching copies of your filiation documents. If they refuse, file in the Regional Trial Court: a petition for judicial settlement, or an action for partition, annulment of the settlement or reconveyance. See judicial settlement of an estate. If property titles are being transferred, ask a lawyer about annotating your claim with the Registry of Deeds.
There is a will that leaves you out or gives you too little. Raise the issue in the probate proceeding, since omission of a compulsory heir or impairment of the legitime can be challenged there. See compulsory heirs and legitime.
The claim is against a grandparent’s estate. Gather proof of your filiation to your deceased parent and of your parent’s relationship to the grandparent, then rely on Aquino v. Aquino and the representation rules. Claims against an uncle’s, aunt’s or sibling’s estate across the legitimate–illegitimate line remain barred without a will.

Documents to bring to any lawyer or PAO interview: PSA birth certificate; written acknowledgments (affidavits, letters, signed notes); photos, school or medical records and remittance records showing you were treated as the parent’s child; the parent’s death certificate; copies of any will, settlement deed or newspaper notice of settlement; and copies of titles or tax declarations. If you cannot afford a lawyer, ask the Public Attorney’s Office whether you qualify for free assistance. Court actions over an estate are usually filed in the Regional Trial Court; ask the lawyer whether barangay conciliation must come first for your particular claim.

Key takeaways

An illegitimate child is a compulsory heir; the legitime is one-half of a legitimate child’s (Family Code Art. 176).
The old Civil Code categories and the four-fifths fraction in Art. 895 no longer apply to the size of the share.
Filiation comes first. Secondary evidence works only if the action is filed while the alleged parent is alive.
A grandchild born outside marriage may now represent a deceased parent in a grandparent’s estate (Aquino v. Aquino, 2021); the bar against collateral relatives remains.
An extrajudicial settlement does not bind an heir who did not take part in it or had no notice of it; act quickly once you learn of one.

Related: To see an illegitimate child’s share alongside the other compulsory heirs, in fractions and pesos, use our legitime calculator.

Frequently asked questions

Does an illegitimate child get the same share as a legitimate child?

No. Under Family Code Article 176, the legitime of each illegitimate child is one-half of the legitime of a legitimate child. If there is no will and both kinds of children survive, the intestate shares follow the same one-to-two proportion.

Can I still prove filiation after my father died?

Yes, if you rely on a birth record, a final judgment, or an admission in a public document or signed handwritten instrument. If your only evidence is open and continuous possession of status, DNA or other secondary proof, Family Code Article 175 requires the action to be brought during the alleged parent’s lifetime.

Can an illegitimate child inherit from a grandparent?

Yes, by representing a deceased parent, under the Supreme Court’s 2021 ruling in Aquino v. Aquino, provided filiation is proved. Before that ruling, Article 992 was read to bar it.

Can an illegitimate child inherit from a half-brother or half-sister?

Not by intestate succession when one is legitimate and the other illegitimate. Article 992 still bars it, as applied in Manuel v. Ferrer (1995). A sibling can still leave property to the other by will.

Is an extrajudicial settlement valid if I was not included?

It does not bind you. Rule 74, Section 1 of the Rules of Court says no extrajudicial settlement binds a person who did not participate in it or had no notice of it, and Section 4 lets a deprived heir compel settlement in court within two years after distribution.

Sources

Sources rechecked as of: October 8, 2026

This guide is general legal information, not legal advice. CivilLaw.ph is not a government agency, court or law firm. For a specific estate, consult a Philippine lawyer or the Public Attorney’s Office.

Inheritance Rights of Illegitimate Children in the Philippines