tickingbird
^Oh and they speak Farsi. I've taught children who only spoke it.^
Oh you speak fluent Farsi too? Amazing 
Unlikely. Re Farsi, the I’ve taught children who only speak it sounds boastful if you don’t work in school. It might just be that, but . . .
We get children in school who don’t speak English, but only their mother-tongue. It used to be because their parents were at Uni here, or because they were immigrants, so we had Mandarin, Taiwanese, Russian, Urdu etc. Now it’s also refugees, e.g. from Ukraine or Iran.
We (and they) learn to cope, and they learn English far quicker than we learnt any of their languages. Though we all make an effort to say a few words, even if it’s only greetings.