Principle: When a future event on which a contract is dependent is the way in which a person will act at an unspecified time, then the event shall be considered to become impossible when such person does anything which renders it impossible that he should so act within any definite time, or otherwise than under further contingencies. If the event become impossible such agreements become void.
Factual Situation: A agrees to pay B a sum of Rs.1 if B marries D in A's lifetime. D marries E and soon thereafter. A dies. Whether an agreement between A and B could be enforced if E dies within 1 year of marriage and B marries D?