I'm so sorry all of you have gone through these things with your parents. I've been lucky, my parents have been so helpful especially my dad. I would think it's best to keep your distance from any of these toxic people. It's unfortunate that they refuse to get professional help. Don't let them bring you down. Is there someone you work with or in your life that is somewhat like a parental figure? Maybe in-law's, coworkers, aunts, etc There are good people out there, but sometimes it's hard to open up to them.