My ex is refusing to tell mr when he is going to see dc (boys aged 13 and 16) he sees for about four hours once a week, his descion/choice. This is causing a great deal of stress as he will let one child know when he is going to see them but not the other and has been on very short notice like today the boys had a half hour notice! Not sure what to do that isn't going to upset dc, help please!