DC have different activities after school, but both in the same venue. These have always been at the same time but today DD (9) has moved up a stage and her class is at a later time. DP and I agreed that I would pick up DS however I was running late (due to health issue). DP often picks up DS if I am running late (and we have this agreed due to work/health) so this isn't a problem.
The issue is that I asked him to bring DS out to the car once DD had gone into her activity. He said it starts in five minutes and I said ok it'll take me that long to get there so I'll leave now. I get there and dp is out waiting with DS. He goes to chemist briefly and then back in and finds DD still waiting to go into activity, she's missed two thirds of it. She was waiting because she didn't know what to do- first class at new time and probably a new teacher.
So DP didn't wait for her to go in because he thought me coming now meant I wanted DS outside ready to be picked and not only that he didn't tell DD he was coming outside so she had no idea where he was. AIBU to think he should have waited for DD to go in even though I said I'm coming now?