Hi what a terrible story I’m so sorry you’ve been through all this… I’m wondering how your son is allowed to see his kids as he is at the moment I would personally get court order for supervised visits and get a restraining order simply because of the children you have with you at home still… I won’t tell you to turn your back on him because I couldn’t do that although some will say it’s the only way I’m sorry I don’t have the answers but wish you well and maybe if you haven’t already get some counselling x