The following shall be sufficient causes for disinheriting a spouse:
(1) When the spouse has been convicted of an attempt against the life of the testator, his or her descendants, or ascendants;
(2) When the spouse has accused the testator of a crime for which the law prescribes imprisonment of six years or more, and the accusation has been found to be false;
(3) When the spouse by fraud, violence, intimidation, or undue influence cause the testator to make a will or to change one already made;
(4) When the spouse has given cause for legal separation;
(5) When the spouse has given grounds for the loss of parental authority;
(6) Unjustifiable refusal to support the children or the other spouse. (756, 855, 674a)