Sink or swim.
If they don’t learn English now then they never will.
Nobody hired “bilingual aides” for the millions of immigrants from central, southern or eastern Europe.
Or Latin Americans.
My family immigrated to San Francisco when I was 9. The only special help we got, maybe, was speaking slower at times, and slang.
Within two years I was consistently among the top three students in the class.
We had lots of immigrant company then, from all over the world, and not a foulmouth or thug among them, that I can remember.