Had previous threads detailing but stbxh and I divorcing and under same roof while house sale is going through. He has previously upset dc by poisoning them against me and had sort of settled down. I had worked really hard to get the dc back 'on side' and now I find out he's been at it again 
Making little comments about me, telling eldest (8) things about arguments we've had. I am ashamed but I smacked ds on the bum when things were particularly bad and he was hitting and punching me and wouldn't stop. Ex has told him that I broke the law 
I now find out he's told him that once he's settled in his new place he's going to go to court so they can go live with him 
I asked ds what he thought about it and he said he didn't know. I'm so angry. I posted before about him working 24/7 and wanting them 2 week nights per week but he couldn't commit when I suggested he take them for a full weekend once a month yet now he's saying all this??! 
I have never once said to him I would prevent him seeing the kids. All I've said is that he needs proper quality time with them and not just 2 week nights when they're at school!
I'm sure he couldn't fight for custody but I'm worried with him saying things to ds about me breaking the law that he's starting to try and set a scene for further down the line. He never loses his rag with the kids as a) he is hardly here and b) when he is home he plays Disney dad letting them stay up late/ sweets and no discipline. Just when I think things are starting to look more positive 