How can my ex keep our older, sick daughter from harassing him by phone?

My ex, Satan, and I have a forty nine year old daughter who has been on various drugs since she was fifteen. She refuses to work and drives any man she lives with totally nuts and she’s very hard to get rid of. One man left town and she followed him years ago, leaving her son and dog with us for three months. The guy she’s with now is violent and she won’t stop talking or yelling, he claims. He hurts her but she continues going over there. Now she is driving my ex crazy by calling him and he has three numbers. She’s calling all three of them, yelling, insulting and lecturing him day and night . He is seventy eight with spinal stenosis. He says he hates her and wants to get her arrested for “senior abuse.” Is that possible if she lives in a different state and how long would she be in jail? I want to add that our younger daughter is every parent’s dream. And no; I won’t call her and get involved. Just looking for some feedback on how he can rid his life of her. Trust me ; I can’t be around her for more than an hour.