I'm not sure if I'm BU here. I'm not overly close to my parents and brother, I speak to them on the phone and visit them every couple of months as they live a three hour drive away.
When I visited them this week they fancied going out for fish and chips for lunch, so I offered to drive and asked if we could go at noon as ds aged 2 normally has a nap at 1, so even if we were late back them hopefully he could have a nap at 130ish. They said they wanted to go at 1230, so I agreed, knowing ds would be quite grumpy through a late nap but not wanting an argument with them.
Then they said they would like to plan to stop by in a bakery on the way home and sit down in the cafe for cake. I asked if we could do that later in the afternoon, as I was hoping ds could have a nap after lunch as otherwise he'd be grumpy, I offered to drive us all back to the bakery for afternoon tea later on instead. They wouldn't accept my suggestion and were quite rude to me, saying I was causing problems etc, so I went along with their plan, ds slumped on me in the bakery, cried because he was tired and never had a chance to sleep as we weren't finished until 2pm. He was grumpy all afternoon which wasn't fun for him or me.
I think it would have been easy for my parents to have been more flexible and made my life much easier, there were no other plans for the afternoon. Whenever I visit them similar things happen, they aren't interested in making my life easier by fitting in lunchtimes etc, will insist that ds should have tea at 7pm etc when they want to eat and object if I want to feed him earlier (he usually eats at 5pm) as apparently children and parents need to be flexible 
Aibu and pfb?