Nakasaad sa ating civil code na maaari lamang hindi mabigyan ng mana ang isang tao kung ito ay madisinherit sa pamamagitan ng isang will kung saan nakasaad ang legal cause ng disinheritance.
Ang mga sumusunod ang sufficient causes ng disinheritance para sa isang anak, ayon sa ating Civil Code:
(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.
Ang allowable grounds naman ng disinheritance ng parents ay:
(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.
Kung ang taong may-ari ng properties ay gumawa ng will para madisinherit ang tagapagmana niya, hindi na makakatanggap ng mana ang nadisinherit. Gayunpaman, ang mga anak ng nadisinherit ay pwedeng magrepresent sa kanya sa mana mula sa gumawa ng will.