law: The Indian Succession Act, 1925
  Chapter X.- Of Contingent Bequests
  124. Bequest contingent upon specified uncertain event, no time being mentioned for its occurrence.-
  Where a legacy is given if a specified uncertain event shall happen and no time is mentioned in the will for the occurrence of that event, the legacy cannot take effect, unless such event happens before the period when the fund bequeathed is payable or distributable.
  Illustrations
  (i) A legacy is bequeathed to A, and, in case of his death, to B. If A survives the testator, the legacy to B does not take effect.
  (ii) A legacy is bequeathed to A, and, in case of his death without children, to B. If A survives the testator or dies in his lifetime leaving a child, the legacy to B does not take effect.
  (iii) A legacy is bequeathed to A when and if he attains the age of 18, and, in case of his death, to B. A attains the age of 18. The Legacy to B does not take effect.
  (iv) A legacy is bequeathed to A for life, and, after his death to B, and, "in case of B's death without children," to C. The words "in case of B's death without children" are to be understood as meaning in case B dies without children during the lifetime of A.
  (v) A legacy is bequeathed to A for life, and, after his death to B, and, "in case of B's death," to C. The words "in case of B's death" are to be considered as meaning "in case B dies in the lifetime of A".
  125. Bequest to such of certain persons as shall be surviving at some period not specified.-
  Where a bequest is made to such of certain persons as shall be surviving at some period, but the exact period is not specified the legacy shall go to such of them as are alive at the time of payment or distribution, unless a contrary intention appears by the will.
  Illustrations
  (i) Property is bequeathed to A and B to be equally divided between them, or to the survivor of them. If both A and B survive the testator, the legacy is equally divided between them. If A dies before the testator, and B survives the testator, it goes to B.
  (ii) Property is bequeathed to A for life, and, after his death, to B and C, to be equally divided between them, or to the survivor of them. B dies during the life of A; C survives A. At A's death the legacy goes to C.
  (iii) Property is bequeathed to A for life, and after his death to B and C, or the survivor, with a direction that, if B should not survive the testator, his children are to stand in his place. C dies during the life of the testator; B survives the testator, but dies in the lifetime of A. The legacy goes to the representative of B.
  (iv) Property is bequeathed to A for life, and, after his death, to B and C, with a direction that, in case either of them dies in the lifetime of A, the whole shall go to the survivor. B dies in the lifetime of A. Afterward C dies in the lifetime of A. The legacy goes to the representative of C.