A future interest is the right to possess a piece of property in the future.
- with a condition precedent before the remainder-holder can take possession or
- one that is given to an unascertained person.
It's like being subject to a condition subsequent, but backwards. Something has to happen before the natural termination of the preceding estate.
e.g. O to A for life, then to B if B has reached 25 years old.
If a remainder first just says to someone (to B, but if B does not survive A...), it is a vested interest subject to divestment. If a remainder put the condition in the same clause (to B if B survives A), it is a contingent interest.
- If anything has to be done first, such as kids being born or people surviving, it is contingent, not vested.
An executory interest automatically takes effect upon the happening of the condition.