The Collaborative International Dictionary
Coparcener
Coparcener \Co*par"ce*ner\ (-n[~e]r), n. [Pref. co- + parcener.] (Law) One who has an equal portion with others of an inheritance.
All the coparceners together make but one heir, and
have but one estate among them.
--Blackstone.
Wiktionary
coparcener
n. Any of several people who share an inheritance; a parcener.