law: Transfer of Property Act, 1882
  29. Fulfillment of condition subsequent
  An ulterior disposition of the kind contemplated by the last
  
  preceding section cannot take effect unless the condition is strictly
  
  fulfilled.
  Illustration
  A transfers Rs. 500 to B, to be paid to him on his attaining his
  
  majority or marrying, with a proviso that, if B dies as minor or marries
  
  without C's consent, Rs. 500 shall go to D. B marries when only 17 years of
  
  age, without C's consent. The transfer to D takes effect.