551. In order to inherit, it is necessary to be in existence at the moment when the succession devolves; thus, the following are incapable of inheriting.
1. Persons who are not yet conceived;
2. Infants who are not viable when born.
552. Aliens may inherit in the same manner as British subjects.
553. The following persons are unworthy of inheriting and, as such, are excluded from successions:
1. He or she who has been convicted of killing or attempting to kill the deceased;
2. He or she who has brought against the deceased a capital charge, adjudged to be calumnious;
3. The heir of full age, who, being cognizant of the murder of the deceased, has failed to give judicial information of it.
554. The failure to inform cannot however be set up against the ascendants or descendants, or the husband or wife of the murderer, nor against the brothers or sisters, uncles or aunts, nephews or nieces of the murderer, nor against persons allied to him or her in the same degrees.
555. Any heir who is excluded from the succession by reason of unworthiness is bound to restore all the fruits and revenues that he or she has received since the succession devolved.
556. The children of an unworthy heir are not excluded from the succession by reason of the fault of their father, if they come to it in their own right and without the aid of representation, which in this case does not take place.