In other words, be someone who takes their feelings into consideration and be someone who shows that he want's to experience their well being instead of seeing them as a tool to injure the other party. From how you've described him, that's all I could see him treating them as, a tool to win, something that's pretty common with narcissism. I agree, work together with you since ultimately its bigger than him, it's the kids in the middle that have to deal with the stress and trauma. You know it's funny, since he's already been an ass to report you to the police with the "evidence" that he read through, it should be clear to him that you're not trying to win, you're trying to do your best for your children. Also this just popped into my head, but we had a friend who was in a similar situation, abusive ex, trying to get custody, wouldn't let her leave the state, and ultimately her solution was to buy a rv, and essentially took it to texas and lived in a campground where she could get by on the low cost of renting a space until they were old enough to do what they wanted to do. This way she avoided being homeless so that dhs wouldn't take her kids, and she had something stable, even it was only an rv.