My ex husband has become increasingly unreliable over the last couple of years and now my children are refusing to go with him. Kids are 10 and 7 and dad is suppose to have them one night every two weeks, which has decreased in the last year from two nights. He often cancels last min when I have things booked in and won't even give a reason why he's had to cancel or offer another date to have them. This has really left me in a difficult position where I now only book things if I know I have back up childcare. The kids are now saying all they do is sit in their room at his house and have to eats meals in their room when staying over. Understandably the kids don't want to stay anymore and I don't feel comfortable them staying either. I have tried to speak to him about it and he always says he will try more, but nothing changes. I even tried to get him to go to mediation to discuss childcare, but he refused to go. I know if I say to him I will stop the kids going he will get nasty with me. For reference he's naturally very lazy and has no awareness to other peoples needs or emotions.