en_tn/mrk/12/07.md

the heir

This is the owner's heir, who would inherit the vineyard after his father died. AT: "the owner's heir" (See: rc://en/ta/man/translate/figs-explicit)

the inheritance

The tenants are referring to the vineyard as "the inheritance." AT: "this vineyard" (See: rc://en/ta/man/translate/figs-synecdoche)