In Philippine law, succession and inheritance are governed primarily by the Civil Code of the Philippines (Republic Act No. 386, as amended), particularly Book III thereof, and supplemented by the Family Code of the Philippines (Executive Order No. 209, as amended). The distinction between legitimate and illegitimate children plays a significant role in determining inheritance rights. While the 1987 Constitution and the Family Code emphasize the equal protection of children regardless of the circumstances of their birth, the Civil Code retains certain distinctions in the area of succession. This article explores the inheritance rights of illegitimate children, with particular focus on the scenario where legitimate heirs have predeceased the decedent, thereby potentially altering the distribution of the estate.

Legal Classification of Children

Under Article 164 of the Family Code, children conceived or born during the validity of a marriage are considered legitimate. Conversely, Article 165 defines illegitimate children as those conceived and born outside a valid marriage. Illegitimate children include those born of marriages that are void from the beginning or annulled, as well as those born from casual relationships or adulterous unions.

Legitimation may occur if the parents subsequently marry, provided the child was conceived prior to the marriage (Art. 177, Family Code). Upon legitimation, the child acquires the status of a legitimate child for all purposes, including inheritance.

Filiation and Recognition

For an illegitimate child to assert inheritance rights, proper filiation must be established. Filiation can be proven by:

A record of birth in the civil registry showing the child's filiation.
An admission of filiation in a public document or private handwritten instrument by the parent.
Open and continuous possession of the status of an illegitimate child.
In the absence of the above, through DNA testing or other evidence in court (as recognized in jurisprudence).

Recognition by the father can be done through various means under the Family Code (Arts. 172-175). Republic Act No. 9255 (2004) allows illegitimate children to use the surname of their father if acknowledged.

Status as Compulsory Heirs

Article 887 of the Civil Code enumerates compulsory heirs, which include:

Legitimate children and descendants;
Legitimate parents and ascendants (in default of descendants);
The surviving spouse;
Illegitimate children.

Illegitimate children are compulsory heirs alongside legitimate children. They cannot be deprived of their legitime except for valid causes of disinheritance (Art. 919).

Legitime of Illegitimate Children

The legitime is the portion of the estate reserved by law for compulsory heirs that cannot be freely disposed of by will.

The legitime of legitimate children and descendants is one-half (1/2) of the hereditary estate (Art. 888).
Each illegitimate child is entitled to one-half (1/2) of the legitime of each legitimate child (Art. 895, Civil Code).

Thus, if there are legitimate children, the estate is divided such that legitimate children receive twice the share of illegitimate children in the legitime portion.

In testate succession, the free portion can be given to anyone, including illegitimate children, but legitime must be respected.

Intestate Succession Rules

In the absence of a will, intestate succession applies (Arts. 960-1014, Civil Code).

Legitimate children and their legitimate or illegitimate descendants succeed first.
Illegitimate children and their descendants concur with legitimate children.

Specifically, Article 983 provides: "If there are legitimate children or descendants, and illegitimate children or descendants, the latter shall be entitled to one-half of the share of each of the former."

Example: If a decedent is survived by two legitimate children and one illegitimate child, the estate is notionally divided into 2.5 parts (2 full shares for legitimate + 0.5 for illegitimate). Each legitimate gets 2/5, the illegitimate gets 1/5.

When Legitimate Heirs Are Deceased

This is the core scenario. "Legitimate heirs" typically refer to legitimate children or their descendants as primary compulsory heirs.

If all legitimate children predecease the decedent:

With Descendants (Representation): The descendants of the deceased legitimate children represent them and inherit the share their parent would have received. These representatives (grandchildren) take per stirpes. The surviving illegitimate children of the decedent would still receive only their reduced share (half), while the representatives of the legitimate lines take full legitimate shares.

Representation in the descending line is permitted regardless of whether the representative is legitimate or illegitimate (Arts. 981, 982). However, the share represented is the share of the legitimate child being represented.
Without Surviving Descendants of Legitimate Children: If the legitimate children die without their own descendants, or if those descendants also predecease without further representation, the illegitimate children of the decedent become entitled to the entire estate. They share the inheritance equally among themselves (per capita if in the same degree).

In this case, since there are no competing legitimate descendants, the illegitimate children succeed to the whole hereditary estate as the sole descendants.

Note that the surviving spouse, if any, would concur with the illegitimate children, taking a share equal to that of an illegitimate child or as per rules in Art. 999 or 1001.

Right of Representation and Limitations

Representation allows a person to take the place and degree of his deceased ascendant (Art. 981). It is allowed only in the direct descending line and in favor of the children of brothers or sisters (collateral, limited).

An illegitimate child can represent his/her parent if the parent is a legitimate or illegitimate child of the decedent. However, the represented parent's status determines the share taken.

The Article 992 Barrier ("Iron Curtain Rule")

A critical limitation is found in Article 992 of the Civil Code: "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."

This creates a barrier between the illegitimate child and the legitimate relatives of his/her parents.

An illegitimate child cannot inherit from his legitimate grandparents, legitimate uncles/aunts (siblings of parent), or other legitimate collateral relatives.
Conversely, they cannot inherit from him.

This rule applies even if the legitimate heirs (e.g., legitimate uncles/aunts) are deceased. Their own legitimate descendants would represent them, but the illegitimate nephew/niece remains barred from participating in the intestate succession of the grandparent or other ascendant/collateral.

Exceptions or nuances:

The rule does not apply if the inheritance is from the common parent (direct parent-child).
It does not apply to testate succession (wills can override).
If the link is through an illegitimate parent, then relations on that side may allow inheritance.
Jurisprudence has strictly applied Art. 992, though it has been criticized as outdated and contrary to modern views on equality.

If all legitimate collateral heirs are deceased without their own representatives, the estate may pass to the next in line, but the illegitimate child of a different branch is generally excluded due to Art. 992.

Special Cases

Adoption: An adopted child is considered legitimate for inheritance purposes.
Predecease and Accretion: If a compulsory heir predeceases, his share may accrue to co-heirs under certain conditions.
Disinheritance: Valid causes must be proven in a will (Arts. 916-918).
Support During Lifetime: Illegitimate children have equal right to support from parents (Family Code), which is separate from inheritance.

Jurisprudential Insights

Philippine courts have upheld the distinctions in the Civil Code while liberally construing rules on filiation to favor the child. Cases emphasize the need for clear proof of filiation. In situations where legitimate heirs predecease, courts determine shares based on the number of surviving lines and the status at the time of the decedent's death.

Efforts to reform Art. 992 have been proposed in Congress to align with constitutional equality, but as of current law, it remains in effect.

Conclusion on Rights When Legitimate Heirs Deceased

In summary, when legitimate children and their descendants have all predeceased the decedent without further representation, the illegitimate child(ren) ascend to inherit the full estate in intestate succession. However, in collateral or ascendant lines involving legitimate relatives, Art. 992 may bar claims even in the absence of competing legitimate heirs if the relationship falls within the prohibited barrier. This framework ensures that while distinctions exist, the law provides mechanisms for illegitimate children to claim their rightful share, especially when the primary legitimate descending line is extinguished.