I had a teacher who used to say that her parents came from Ukraine and that they spoke a different language at home. I always thought that was weird. Speak English for goodness sake.
Easier said than done; conversations in a second language can be torturously slow (and “inaccurate”). If we had full immersion (where people weren’t getting radio/TV in the native tongues), it might work - it did for over a century - but nowadays it is too easy to get along without English.