People speak more than one language at home. "speak a non-English language at home" = speak non-English language and maybe English "don't speak English at home

People speak more than one language at home. "speak a non-English language at home" = speak non-English language and maybe English "don't speak English at home" = speak non-English language and never English It sounds like they didn't study English-speaking at home, just what other languages are spoken.