Section 114(ii) in The Indian Succession Act, 1925
(ii)A fund is bequeathed to A for his life, and after his death to B for his life, and after B’s death to such of B’s sons as shall first attain the age of 25. B dies in the lifetime of the testator, leaving one or more sons. In this case the sons of B are persons living at the time of the testator’s decease, and the time when either of them will attain 25 necessarily falls within his own lifetime. The bequest is valid.