We don't have synonyms for mestee yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are testee, mentee and mustee.
(n) :
a mixed race person, especially if mostly white in ancestry, appearance and culture; a member of an old mixed race group, particularly those groups which identify more with their white ancestry than with their black or Native American ancestry, like the Melungeons and the Brass Ankles
(adj) :
of mixed race people, especially if mostly white in ancestry, appearance and culture; of an old mixed race group, particularly those groups which identify more with their white ancestry than with their black or Native American ancestry
(n) :
a mixed race person, especially if mostly white in ancestry, appearance and culture; a member of an old mixed race group, particularly those groups which identify more with their white ancestry than with their black or Native American ancestry, like the Melungeons and the Brass Ankles
(adj) :
of mixed race people, especially if mostly white in ancestry, appearance and culture; of an old mixed race group, particularly those groups which identify more with their white ancestry than with their black or Native American ancestry