I hope I have better luck on AIBU today 
I will try to tell the full story from the start. I have babysat sometimes for my brother, looking after his 3 year old dd which has always been fine except I think his wife is very anxious because she always calls while I'm looking after her daughter. Yesterday I looked after their dd all day and she called about half an hour after leaving her to see if she had settled. I told her she was fine and asked her not to phone again because everything was fine and I wanted to get on with the day with all the kids together (I've got 2). She got upset and asked why she couldn't phone and said she might want to call later in the day to let us know when she's on her way back. I said ok but was irritated by her checking up on me although she said she wasn't checking up on me but that she wanted to feel she could call to see how her dd was. Anyway, she phoned after lunch and I didn't pick up and was busy so didn't call back. I picked up her call when she was on her way back (about 4 hours later) but she was very uppity and was upset that I hadn't returned her call. Today my brother phones furious that I told her I didn't want her to keep on phoning me. In the end I've said I don't want to babysit for them again and now they're really hurt. They're also cross that I didn't put their dd in overalls when she painted and they said her clothes are ruined. There's a big family bbq coming up and I'm dreading it now.