Texas Property Code - PROP § 5.003. Partial Conveyance

(a) An alienation of real property that purports to transfer a greater right or estate in the property than the person making the alienation may lawfully transfer alienates only the right or estate that the person may convey.

(b) Neither the alienation by deed or will of an estate on which a remainder depends nor the union of the estate with an inheritance by purchase or descent affects the remainder.