So I have 2 children with my ex. He has been having them 1 or 2 nights a week and a bit more in school holidays since October. He has had issues in the past and recently with managing their behaviour. His gf is pregnant and mentioned to her midwife how bad their behaviour is and how much of a worry it will be when their baby arrives. The children do not behaviour this severly for me. They do argue sometimes (like normal siblings) but the behaviours their dad and his gf describe is quite severe. The midwife then referred it to social services to get them support. My initial reaction was to say they weren't going to stay there any more until it is all resolved but he is arguing there is no problem. Just want some advice.