For non-native English Speakers

I'm always intrigued by people who know more than one language.

What language do you think in?
English if i'm in an English environment, Chinese if i'm in an Chinese environment, something that's not a language when I'm doing math
What language do you dream in?
Usually nothing is spoken when you dream (maybe it's just me, but I never talk to people in dream, we just kinda know what we're doing), with some rare cases that you hear voices/music etc, sometimes there's english, sometimes there's chinese, sometimes there's french (I learned in high school) sometimes it's a language I can make out what it is, (e.g Japanese) but don't understand the meaning.
What language does your family speak? Chinese most of the time