Wasi-wari is part of the Nuristani branch of the Indo-Iranian languages, which show both Iranian and Indo-Aryan influences, but are otherwise not closely related. Nuristani languages were formerly considered to be Dardic languages, however, they are dissimilar enough from the other Dardic languages to constitute their own branch of the Indo-Iranian language tree.
Wasi-wari belongs to the Nuristani subgroup of Indo-Iranian languages, which exhibit both Iranian and Aryan influences, but are otherwise distinct from other languages in the same family.