It really isn’t. You could start with a phone call to the police. I mean, people are throwing solutions at you in this thread, you know the players better than us and how they would react to each. Making a police statement really isn’t much work. The overriding issue is what the impact will be on family dynamics and whether there will be any retaliation. But also, don’t let people walk all over you either. Present reasonable solutions to your parents, and then the worst case solution. But make sure people know they can’t walk all over you, especially in your own home! Silent treatment isn’t working, trying an alternative. Best of luck!