That’s how the immigrating generation does it. The next generation learns English and integrates. They walk the line between both worlds. The generation after that doesn’t speak the “old” language. I’m generalizing, but that’s my understanding. Some traditions are kept, some are lost. Lost of the observances are done onspecial holidays and times of remembrance. After several generations, much is lost. For instance, my mothers father is 100% Hungarian, second gen. American. I speak no Hungarian. Her mother is French Indian, I speak no French or Abnaki. My dads side is Scots-Irish. Ok, I’m actually trying to learn Gaelic, but for reasons of my own, and I don’t know anyone in my family who has spoken Gaelic for many generations. I’d run the other way if I saw a Haggis.