He said that I should "put the kids ahead of myself."
Well, its kind of true, even though he is saying it only to manipulate you. If you truly think the kids would have a great time, I would let them go with your X.
But this one...
Quote:
He is also going away for the weekend and won't be taking them to dinner on his Friday night, I found out today. I now have to cancel plans that I had made. He asked if he could take them Monday, instead (my day).
...I am not sure about. Whatever you decide, I would tell him that from now on, you are happy to switch up days/nights with him, but that you will need more notice. Ask him just to shoot you an email next time.