Section 119(vi) in The Indian Succession Act, 1925
(vi)A fund is bequeathed to A, B and C in equal shares to be paid to them on their attaining the age of 18, respectively, with a proviso that, if all of them die under the age of 18, the legacy shall devolve upon D. On the death of the testator, the shares vested in interest in A, B and C, subject to be divested in case A, B and C shall all die under 18 and, upon the death of any of them (except the last survivor) under the age of 18, his vested interest passes, so subject, to his representatives.