Every gift inter vivos made by a person having no children nor descendants is revoked by the mere fact of the occurrence of any of the following cases:
(1) When the donor, after the gift, should have or adopt children even should they be posthumous.
(2) When the child of the donor, whom he supposed dead when he bestowed the gift, is found to be alive.
History —Civil Code, 1930, § 586; May 31, 1972, No. 76, p. 165, § 1.