I spent several years in Spain and it is embarrassing just how many make no attempt to learn the language.
Many, with children, would send their kids to school, who then learned Spanish and became their parents’ translators, similar to the example you give. I always felt sorry for the kids. New country, new school, no friends and a language they didn’t understand.
I tried my best to learn the language, and can make myself understood, but I really wasn’t very good at “hearing” the responses, unless they spoke very slowly and clearly, without abbreviations and localisms. I can read and understand Spanish better than when it is spoken.
I currently work with several Polish, some Romanians, Portuguese and so on and their English is very good.
As the old joke goes.
If you speak 3 languages you are trilingual.
If you speak 2 languages you are bilingual.
If you speak 1 language you are English.