Otherwise, all this discussion is rather unimportant to you and will concern only us Filipinos.
First, let us distinguish between what is testate and intestate succession and what is its effect. A succession is testate when there is a will, consequently, when there is no will it is called intestate succession. Compulsory heirs cannot be denied, whether the succession is testate or intestate, and even their designated legitime (share) under the law cannot be changed, notwithstanding the type of succession.
Who are the compulsory heirs by order of preference:
1) Children (legitimate and illegitimate; adopted children are treated as legitimate heirs);
2) Spouse (legal spouse only);
3) Parents (whether adoptive or not);
4) collateral relatives (brothers/sisters/cousins) only in the absence of above.
The presence of a spouse AND child/children, will result in the exclusion of parents.
The presence of parents in the absence of a child/children, will result in the exclusion of collateral relatives.
Let me emphasize, only the free disposable portion may be disposed of by will. Compulsory heirs cannot be deprived of their legal right to their legitime, no matter how much the testator dislikes them. Only by means of their disinheritance through a will can they be deprived of their legitimes, and only for causes expressly provided for by law.
Let us now discuss the distribution of the estate based on who are the surviving compulsory heirs:
- Spouse ONLY (without surviving parents or children) - the Spouse shall inherit 1/2 of the estate and the other half the testator may already freely dispose. Article 900 of the Civil Code
- Spouse and ascendants (without children) - Spouse inherits 1/4 of the estate, and the ascendants (assuming there are two still surviving) shall inherit 1/4 each, 1/4 shall remain as free disposable portion. Article 893 of the Civil Code
- Spouse and legitimate children - Children gets half of the estate and spouse gets 1/4 of the estate; the remaining 1/4 is free disposable portion; if there are two or more legitimate children, the spouse shall inherit equally with the children. Article 892 of the Civil Code
- Spouse and only one illegitimate child - Child gets 1/3 and spouse gets 1/3, the remaining 1/3 is the free disposable portion. Article 894 of the Civil Code
- The legitime of an illegitimate child who is an acknowledged natural child or a natural child by legal fiction is 1/2 the share of a legitimate child. Article 895 of the Civil Code
- The legitime of an illegitimate child who is neither the above is 4/5 the share of an acknowledged natural child. Article 895 of the Civil Code