You are so incredibly kind and nice! I would have been yelling up a storm if he didn't bring them home when he was supposed to. I would have been fine with the extra night as long as I knew in advance. I mean stuff does happen.
I haven't played the "situation" like you suggested. For example, last Tuesday D10 had her concert. It was his choice to not take them but he wanted to take the girls to a skating event. I let him do it. No taking away days, I was just glad that he was spending time with them when he has them versus holed up in his room talking to skank while they are at his house!
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory