Then I usually start working with the parents in Spanish, for which they seem very grateful. I know that it's hard for adults to learn a new language. However if they want to be part of the USA, they need to make that effort. There are countless programs for English as a second language, most for free. I learned Spanish for them, they should make an effort to learn English for me.
Truthfully, I would recommend for all Americans to learn a second language, it opens thousands of doors for you. And I would recommend for all new Americans to start learning English, it opens critical doors for you.
As the old Cuban guys who founded my old bank used to say, all you need to do is learn enough English to get a loan and sell your business plan, and you will go far.