-aččäw - their; them (genitive and accusative pronominal suffix, 3 pl.) (Bulakh–Kogan 2013b:101)

The possessive suffix is extended by the plural marker -ač. It is uncertain whether -äw a the reflex of *-omu with non-trivial phonological development or it should be related to the 3 masc. sg. marker -(ə)w (Bulakh–Kogan 2013b:103).