Philippine Civil Code, Art. 919

The following shall be sufficient causes for the disinheritance of children and descendants, legitimate as well as illegitimate: (1) When a child or descendant has been found guilty of an attempt against the life of the testator, his or her spouse, descendants, or ascendants; (2) When a child or descendant has accused the testator of a crime for which the law prescribes imprisonment for six years or more, if the accusation has been found groundless; (3) When a child or descendant has been convicted of adultery or concubinage with the spouse of the testator; (4) When a child or descendant by fraud, violence, intimidation, or undue influence causes the testator to make a will or to change one already made; (5) A refusal without justifiable cause to support the parent or ascendant who disinherits such child or descendant; (6) Maltreatment of the testator by word or deed, by the child or descendant; (7) When a child or descendant leads a dishonorable or disgraceful life; (8) Conviction of a crime which carries with it the penalty of civil interdiction. (756, 853, 674a)