Yiddish is not Pidgin german, it is Yiddish its own language. With a whole history , culture and Literature with it.
The problem none of these are taught and the yiddish spoken is lousy Yiddish and its taught at the expense of English and Hebrew. if AFTER your kids speak , read and write perfect english you want them to learn Yiddish, Gezun Deh heh. And when you do, make sure its GOOD Yiddish and not Yinglish