Why don't you ask H what is thoughts are about the kids issue, calmly? I think if you look deep inside you would likely have to admit that your frustration is not really with this scheduling issue but the whole scenario and that the kids schedule, while not ideal, is a proxy for pushing for reconciliation or living together again. No fault in that. It's probably better if everyone were under the same roof but that's not the case now. Tomorrow things maybe different but they are not different today. So what is the best that can be done for your children as things stand today? Ask yourself what that is and do that. This is the point where you really have to give up trying to control H and the situation. It hasn't worked thus far. Let it go. Things will not be perfect right now and you can't really know that spending time with H at your FIL's during the school year would be the worst thing for your children. You really can't.