My 8-year-old has a severe temper. He is the third out of six children, and we are homeschooling the other five. He will spend a week at my mother's house and is calm there, but when he gets back the anger and outbursts resume after 24 hours. His outbursts include beating up on siblings, throwing whatever he can find, damaging the house, screaming, threatening, etc. This never happens at my mom's house. If she says to jump, he would instantly ask how high and how far. He is calm everywhere else except here. I don't know what to do anymore.