It shall not be necessary, as at common law, that a contingent remainder be supported by a particular estate of the dignity of a freehold, but it shall be sufficient and lawful for contingent remainders to be supported by a preceding estate for years.
Contingent remainder supported by less than freehold
Tenn. Code Ann. § 66-1-105, under General Provisions.
Tenn. Code Ann. § 66-1-105