Ex collects DD9 one night a week from school. He often let's her down on the set night for various reasons. Which of course means I have to have her that night. I work at the same school so he assumes I'm just available cos I'm there. Yes, I'm there but it means cancelling what I'd planned to do. I"ve sometimes had meetings I cant camcel & had to pay for childcare when he isnt collecting. Often he wants to collect her the next night instead. She's booked into our ASC that night & I have to pay whether she attends or not. I'm sick of paying for it when she's with him, & money is tight. He does pay maintenance but not a lot as he doesn't work much.. So this week I suggested he pay the fee if he wanted her that night. Apparently his family have had a good laugh at that. AIBU?