I didn't know any serious linguist ever questioned that Yiddish is a variant of German. One might ask if Germanic and other IE languages carry some old Afroasia

I didn't know any serious linguist ever questioned that Yiddish is a variant of German. One might ask if Germanic and other IE languages carry some old Afroasiatic Neolithic stratum from before the spread out of Anatolia / Southern Caucasus but that's a much deeper question.