I understand. I have a brother who is a sociopath, but as an adult, I am luckier than you, as he lives in Eastern Europe, probably under an assumed name. Your sister is near. You should immediately change your number so she can't harass you. This is my story: https://medium.com/illumination/the-sociopath-next-door-75ea5d564e89?sk=a44e296504a33262c3fd6fbcc6db9643