My ex husband is the father of my children unfortianatly he is not a good father. He has not paid child support in months because he quit his job for his girlfriend. He keeps dating this woman that is my brothers baby momma. My brother and this woman was just over at my house together and they were in a relationship talking about wedding.. This is not the first time this has happened, she left my brother for my ex again. Well when him and her get together he stops paying child support and ignores his kids. Well my children know that she was just, I mean not even the day before the sudden switch in men, here with my brother and they know that she is their cousins mother. Well now they are all upset and freaking cause he has stopped calling, only wants visitation if I already have them in bed. He started yelling at me in front of the children over the phone screaming and yelling cause he wanted me to give them thier nighttime meds and let them go to sleep so he can come over and get them while they were asleep. I asked him politly on several occasions that until the children were more emotionally stable with everything to pls not include them in his relationship. I have sole physical custody and so it would only be when he bothers to come get them. He had his brother call me and lecture me about not letting her come to my sons birthday party and he refuses to come to his sons birthday after telling him he would come cause I will not invite her. The doctor has had to put my kids on meds to help with their anxiaty and this is all due to him acting the way he is over this one woman. I mean litterally she dates my brother for a couple of months and then my ex and it is just sending the kids for a loop on top of him disowning his kids cause she says she don't like my kids. I mean it is just getting insane he won't even call them unliess I am willing to let her back in my house. I don't think it is right at all. i don't know what to do. On the one hand I believe all kids need their dad but on the other I am so tired of seeing them cry but even when I do what he asks he still acts this way and igmores them. Any advise pls?