I see people have instantly downvoted without thought. I asked if it was a possibility. You asked for advice. I am throwing out advice. Most people seem to be crying to lawyer up and such, you have done this, so are here asking if anyone has any other thoughts. I was merely asking if you, since you know your parents/family better, could be placated.

Yes, you don't want them in your life. But is the odd phone call enough to keep them at bay? And if so, is it worth doing that. If they are the type who would then want more and more, then no, do not give in to them. Again, was just a suggestion to try to keep them at bay. Plenty of people just see the relative they dislike once a year etc just to keep the peace.

They clearly seem to have issues. I would start collecting evidence for that restraining order. It's not me seeing them as family. I am just trying to look objectively at your possible options. I don't know them, or how they'd react, it is why I offered up that suggestion.

I would also definitely let your brother-in-law in on what is happening if they have his address. I'd actually let most of the people in your life who you are close with in on what is going on, both for their safety and yours. If they know what is going on, they can help you in times maybe the police/law cannot.