Told my ex over a month ago, when I received birthday party invites for the children on two of the days he has them. He didn't say anything then. I also reminded him last weekend and again he said nothing. Just received a text this evening saying "I can't take *** to the parties you arranged. Don't arrange any more without checking with me first or pass details onto me so I can arrange in future." He was clearly given plenty of notice and why wait until this evening to tell me this when the parties are this weekend and next? The children also have parties on both the other days of each weekend (postnatal group, hence all close together), so I can't simply ask him if he will swap days. I have already taken them out to choose their friends presents and dressing up costumes (one is a Frozen dressing up party), so they will be upset at missing them. Any suggestions for what I could do. There is no court order in place, so could I simply refuse to let him have them those weekends? This does seem a bit extreme, but he is clearly not putting them first.