Most Helpful Guy
Take the best care of your kids that you can. Then do your thing and don't let your ex make his problems yours. Unless you're hanging with a druggie or a sex offender you're probably OK. Make sure you get all the interactions with him on audio and video. (better yet, just have him send everything through your lawyer and don't talk to him at all)
I hate to talk down about a cop but there's always a chance he'll try to muscle you around with his badge and if he does that he needs his peepee spanked hard by the Dept.