law: The Indian Succession Act, 1925
  Chapter XII.- Of Bequests with Directions as to Application or Enjoyment
  138. Direction that fund be employed in particular manner following absolute bequest of same to or for benefit of any person.-
  Where a fund is bequeathed absolutely to or for the benefit of any person, but the will contains a direction that it shall be applied or enjoyed in a particular manner, the legatee shall be entitled to receive the fund as if the will had contained no such direction.
  Illustration
  A sum of money is bequeathed towards purchasing a country residence for A, or to purchase an annuity for A, or to place A in any business. A choses to receive the legacy in money. He is entitled to do so.
  139. Direction that mode of enjoyment of absolute bequest is to be restricted, to secure specified benefit for legatee.-
  Where a testator absolutely bequeaths a fund, so as to sever it from his own estate, but directs that the mode of enjoyment of it by the legatee shall be restricted so as to secure a specified benefit for the legatee; if that benefit cannot be obtained for the legatee, the fund belongs to him as if the will had contained no such direction.
  Illustrations
  (i) A bequeaths the residue of his property to be divided equally among his daughters, and directs that the shares of the daughters shall be settled upon themselves respectively for life and be paid to their children after their death. All the daughters die unmarried. The representatives of each daughter are entitled to her share of the residue.
  (ii) A directs his trustees to raise a sum of money for his daughter, and he then directs that they shall invest the fund and pay the income arising from it to her during her life, and divide the principal among her children after her death. The daughter dies without having ever had a child. Her representatives are entitled to the fund.
  140. Bequest of fund for certain purposes, some of which cannot be fulfilled.-
  Where a testator does not absolutely bequeath a fund, so as to sever it from his own estate, but gives it for certain purposes, and part of those purposes cannot be fulfilled, the fund, or so much of it as has not been exhausted upon the objects contemplated by the will, remains a part of the estate of the testator.
  Illustrations
  (i) A directs that his trustees shall invest a sum of money in a particular way, and shall pay the interest to his son for life, and at his death shall divide the principal among his children. The son dies without having ever had a child. The fund, after the son's death, belongs to the estate of the testator.
  (ii) A bequeaths the residue of his estate, to be divided equally among his daughters, with a direction that they are to have the interest only during their lives, and that at their decease the fund shall go to their children. The daughters have no children. The fund belongs to the estate of the testator.