Civil Code, Art. 920

The following shall be sufficient causes for the disinheritance of parents or ascendants, whether legitimate or illegitimate: (1) When the parents have abandoned their children or induced their daughters to live a corrupt or immoral life, or attempted against their virtue; (2) When the parent or ascendant has been convicted of an attempt against the life of the testator, his or her spouse, descendants, or ascendants; (3) When the parent or ascendant has accused the testator of a crime for which the law prescribes imprisonment for six years or more, if the accusation has been found to be false; (4) When the parent or ascendant has been convicted of adultery or concubinage with the spouse of the testator; (5) When the parent or ascendant by fraud, violence, intimidation, or undue influence causes the testator to make a will or to change one already made; (6) The loss of parental authority for causes specified in this Code; (7) The refusal to support the children or descendants without justifiable cause; (8) An attempt by one of the parents against the life of the other, unless there has been a reconciliation between them. (756, 854, 674a)