ally alter ego analogon analogue associate brother child clone close copy close match cognate companion complement congenator congener coordinate correlate correlative correspondent counterpart daughter descendant ditto double dupe duplicate duplication equivalent facsimile fellow foster child grandchild granddaughter grandson heiress image kindred spirit like likeness mate model near duplicate obverse offspring parallel pendant picture quadruplicate reciprocal repetition replica replication representation reproduction scion second self similitude simulacrum sister son son and heir sonny soul mate stepchild stepdaughter stepson such suchlike tally the like of the likes of triplicate twin