What is the DOCTRINE OF WORTHIER TITLE?
It is a rule of construction (grantor intent reigns SUPREME) that voids contingent remainders in the grantor's heirs.
e.g., O, who is alive, conveys "To A for life, then to O's heirs."
If the Doctrine did NOT apply, A has a life estate and O's heirs have a contingent remainder.
If the Doctrine DID apply, the contingent remainder in O's heirs is void. A has a life estate and O has reversion.
NY: Doctine of Worthier Title has been ABOLISHED with respect to transfers taking effect after September 1, 1967.