Article 210 — — (3) Order of Debtors.

The persons who are liable to supply maintenance under Article 198 of this Code shall finally bear their liability in the following order: (a) in the first place, the spouse; (b) in the second place, the descendants, according to their degree; (c) in the third place, the ascendants, according to their degree; (d) in the fourth place, the brothers and sisters; (e) in the fifth place, the descendants by affinity, according to their degree; (f) in the sixth place, ascendants by affinity, according to their degree.