Section 19 in The Transfer of Property Act, 1882
Title: Vested interest.
Where, on a transfer of property, an interest therein is created in favour of a person without specifying the time when it is to take effect, or in terms specifying that it is to take effect forthwith or on the happening of an event which must happen, such interest is vested, unless a contrary intention appears from the terms of the transfer.
A vested interest is not defeated by the death of the transferee before he obtains possession.
Explanation.-- An intention that an interest shall not be vested is not to be inferred merely from a provision whereby the enjoyment thereof is postponed, or whereby a prior interest in the same property is given or reserved to some other person, or whereby income arising from the property is directed to be accumulated until the time of enjoyment arrives, or from a provision that if a particular event shall happen the interest shall pass to another person.
Title: When unborn person acquires vested interest on transfer for his benefit .
Where, on a transfer of property, an interest therein is created for the benefit of a person not then living, he acquires upon his birth, unless a contrary intention appear from the terms of the transfer, a vested interest, although he may not be entitled to the enjoyment thereof immediately on his birth.
Title: Contingent interest.
Where, on a transfer of property, an interest therein is created in favour of a person to take effect only on the happening of a specified uncertain event, or if a specified uncertain event shall not happen, such person thereby acquires a contingent interest in the property. Such interest becomes a vested interest, in the former case, on the happening of the event, in the latter, when the happening of the event becomes impossible.
Exception.-- Where, under a transfer of property, a person becomes entitled to an interest therein upon attaining a particular age, and the transferor also gives to him absolutely the income to arise from such interest before he reaches that age, or directs the income or so much thereof as may be necessary to be applied for his benefit, such interest is not contingent.
Title: Transfer to members of a class who attain a particular age.
Where, on a transfer of property, an interest therein is created in favour of such members only of a class as shall attain a particular age, such interest does not vest in any member of the class who has not attained that age.
Title: Transfer contingent on happening of specified uncertain event.
Where, on a transfer of property, an interest therein is to accrue to a specified person if a specified uncertain event shall happen, and no time is mentioned for the occurrence of that event, the interest fails unless such event happens before, or at the same time as, the intermediate or precedent interest ceases to exist.