my family is in complete CHAOS

Things here at home are very bad, VERY bad. A friend of my mother's who she trusted A LOT ended up ruining everything... My mother has a boyfriend, and they get along really well and I really like him a lot, the problem is that my mother's relationship with my grandparents is terrible, and They always do something to make my mother feel bad. This friend of my mother told my grandparents that she was secretly dating a guy and that he was the one she was hanging out with late. My grandmother got angry and asked the housekeeper to put medicine in my mother's coffee so she would get high and not be able to leave the house. The housekeeper here is very nice and she gets along very well with my mother, so she obviously told her everything, now at home it's very complicated... My mother is terrible, very nervous and stressed about everything, she just makes me cry In a way, this affects me too, she has a mood disorder and this situation doesn't make things easier. My grandmother threatened to throw my stepfather's things away and she's about to throw my mother out of the house. My mother will call a friend of hers who is a lawyer and there will probably be police involved in all this. I really don't know what I do.