Well if you are worried about your kids just volunteer to keep them more often even when its her turn....but don' t tell her your reasons...just make it seem like you are being nice. Establish a tighter connection with your kids so that they will tell you anything and everything that may be a concern to their welfare. Kids should never be afraid of what a parent is going to think or do as a result of them telling their parents info....so always talk to your kids and see how they feel and watch what they say and how they say it. But you can't do nothing about the black guy....that's just a skin color....the jail part is a bit bothersome...but it depends on what happened and what it was for. Just like your ex can 't control who you date either....know what I mean? I would establish a good rapport with the ex, you don't want to make her defensive so she hides things from you...you want her to be open an communicative and always pay attention to your kids and what they say and how they act.