Is AUTHOR wrong in the post ? POST : I'm 20F, for reference. 

My great-grandmother lives with my grandmother, and has, ever since she had a heart attack like ten years ago. My great-grandmother was recently diagnosed with dementia, and now needs a lot more care than she used to. As my grandmother is retired/works from home, she is home most of the time and can take care of my great-grandmother. She does like to go out sometimes though, and on those nights other members of the family will go over to "babysit" my grandmother. My brother (16) and I often do this, and we don't mind at all, considering she is our great-grandmother, and we are helping out our grandma. 

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Tonight was one of those nights, and because my brother had babysat the last couple of times my parents asked me to. I agreed, and my grandma  asked if I could go over for 6pm, and said she'd be home around midnight. My parents and my grandma asked if I just wanted to sleep over at my grandmother(s)'s house, but I said no. They had kind of sprung the fat that I'd be spending the whole night there, and I had plans for tomorrow morning, and really just wanted to sleep in my own bed. My grandma doesn't live far, and midnight isn't *that* late anyway. My grandma ended up coming home at around 1am, and I got home at like 1:30. My parents seemed kind of peeved that I came home, implying that I was being shitty for coming home and not staying with them. AITA for coming home? I really just wanted to sleep in my own bed and hadn't planned for sleeping over, I didn't bring a change of clothes, or even my toothbrush. I could tell my grandma was a bit taken aback that I was going home and made sure I knew I could stay, but I genuinely wanted to come home. 