High fiber foods like- Fiber One Cereal, Fiber One Yogurt, Nuts, Apples, Grapes, Cabbage, Broccoli, Whole Wheat high fiber bread. Basically anything with high fiber. Make sure you drink a lot of water and that you are near a restroom. If you Google high fiber foods you find many more.
Old school people
My sister-in-law went to high school with Michelle Phifer
My cousin went to high school with Jessica Alba
Sister went to USC with several famous football players and basketball players, but they never showed up, their stand ins did (sad).
Your family needs some serious therapy/counseling. You cannot continue to live like this. Something/someone is going to explode. Talk to your school counselor or an adult who can give you some references and go (even if it's by yourself).