A presumptive heir is one who, in the present circumstances, would be entitled to the inheritance, but whose rights may be defeated by the contingency of some nearer heir being born. 2 B1 Com.208. In Louisiana, the presumptive heir is he who is the nearest relation of the deceased, capable of inheriting. This quality is given to him before the decease of the person from whom he is to inherit, as well as after the opening of the succession, until he has accepted or renounced it. One who, if the ancestor should die immediately, would under the present circumstances of things be his heir, but whose right of inheritance may be defeated by the contingency of some nearer heir being born; as a brother, who is the presumptive heir, may be defeated by the birth of a child to the ancestor. 2 Bl. Com. 208.