Me and my sons father have always had issues with my son since 2016 when we split as he often cancels and then we create a new rota to his favour and then finally made a rota for me working and turned out he was palming him off on his days. I went to speak to him about having consistency of every sat-sun so he is always having the same for nursery. He started an argument and ended up having wed-thurs one week sat-sun next so HE can have a social life. How can i get it to weekends without a battle as every time he gets angry i end up fearful due to past experiences?