My father's parents were immigrants and they spoke their native language to each other, but they didn't want their kids to learn it. I've tested my father and he has about a 5000 word vocabulary, pretty good for someone whose parents didn't want him to learn it!
Kids have an incredible ability to learn languages, given motivation, and they don't need to go to school to learn words like "accountant" reading books will do.
Kids have an incredible ability to learn languages, given motivation, and they don't need to go to school to learn words like "accountant" reading books will do.