Article 291

The following are obliged to support each other to the whole extent set forth in the preceding article:

(1) The spouses;

(2) Legitimate ascendants and descendants;

(3) Parents and acknowledged natural children and the legitimate or illegitimate descendants of the latter;

(4) Parents and natural children by legal fiction and the legitimate and illegitimate descendants of the latter;

(5) Parents and illegitimate children who are not natural.

Brothers and sisters owe their legitimate and natural brothers and sisters, although they are only of the half-blood, the necessaries for life, when by a physical or mental defect, or any other cause not imputable to the recipients, the latter cannot secure their subsistence. This assistance includes, in a proper case, expenses necessary for elementary education and for professional or vocational training. (143a)