I'll try to keep this brief - EXH and I have 50:50 custody of DD, usually goes pretty smoothly. Saturday night was originally his night but we switched a couple of months ago as he had a party but it suited me to have her Sunday morning so all good. I got an invite for special occasion dinner with friends on Saturday night at a restaurant about 2 mins walk from where I live with DP and DSD. DP was happy for me to accept the invite and would stay at home with both girls while they are in bed. Out of courtesy to DD's dad I let him know arrangements. He is not happy with DP 'babysitting' and would prefer to pay for a babysitter. I don't have an issue as if he feels it necessary it is his money he is wasting. My AIBU is that I've gone back to him and said he is to let me know who is coming and he says it's my responsibility to arrange it. I was satisfied with the arrangements so I think the onus is on him.