My father is the child of immigrants, but he said they never spoke Russian or Yiddish in the home. Maybe they assumed there was just no going back, psychologically as well as physically. Both his parents had spent time exiled/imprisoned in Siberia (my grandfather escaped from a Czarist prison and made his way to North America by way of Vladivostok); but I don't think they had any thought of returning after the revolution (there must have been a period before it became clear how bad the Communists were going to be; but then, the anti-Semitism was sure to remain; both of my father's parents died when I was a child, before I would have thought to ask them their reasoning). I don't know what the immigrant community was like on the Chicago west side of the '20s and '30s when my dad was growing up, what its attitude was towards language and such (and it's only recently that I realize what a dumbfuck I was for not asking): I don't know if Russian, Yiddish, and Ukrainian were still vibrant languages there or were just what old people spoke.