I don't think it's even possible
It's very possible. I have an eleven-year-old cousin who was born to Polish parents in the Sates, and lived all of her life in the States. Her English is just plain awful. And there are plenty of immigrants from Poland from my grandparents generation who lived 70 years in the States without learning English at all.
On the flip side, I also have a British friend her in Wrocław who has been living in Poland for fifteen years, is married to a Polish woman and has two teenage kids. He never learned Polish beyond a few basic words and phrases. Even though he's an English teacher and speaks only English to his kids, their English is not at all impressive. They both have strong Polish accents that do not betray any British influence.