My daughters don't know, and I don't want them to know because kids can't keep their mouths shut and they would tell their friends/teachers who would freak out. When they are older, I will probably let them in on it, might be a good way to teach responsible $$ management in life, not just gambling. Hopefully by then it will be much more common, legal, socially acceptable, etc.
I have played cards with my parents, but never for $$, just for fun.