The dc live with her primarily but DP does loads. He takes the dc to school 2 mornings a week so she can go to work early and miss the traffic, he has to be at her house for 7.45am. He picks the children up once or twice a week, depending if it's his weekend or not - has them EOW for 3 nights. He would pick them up more but he works late 3 nights a week. He is on 25k, she is on something like 40k but she has standard office hours - 9-5, no late nights etc. He is in a tiny rented 1 bedroom flat, she has a large 3 bedroom house with a garden, driveway etc. She also gets child benefit and UC help, DP doesn't see any of that.
DP has just given her £300 towards their swimming lessons and summer holiday clubs - his "half", IMO she should pay more because she earns more, and I don't know why he is paying towards childcare because UC pay for it, but he didn't want her to kick off.
Now he usually picks up the children on Wednesday nights from after school club, again this enables her to work. She has just told him that tomorrow night she is going to see a friend for dinner and won't be back until 9.30pm. DP usually likes to leave her house by 9pm so he can get home and have dinner and prepare for work the next day. DP has told her this and she has kicked off saying she doesn't have a life or time to socialise (she does). I don't think she should be going out that night anyway, because DP has to be in her house without her which I don't really like. He has offered to have the kids overnight Wednesday nights but the dc don't want this.
AIBU to tell DP to put his foot down? He is knackered all the time from working late or looking after the DC while she gets to earn more and get home late as long as he is looking after them!