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The original was posted on /r/AmItheAsshole by /u/PriorityPlayful8781 on 2023-08-11 14:04:22.

This happened last weekend. My dad and his wife, Sandy, were attending a wedding last weekend and hired a babysitter for my stepsister Abby (5f). I (16m) was supposed to do it but I work now so they had to hire someone to stay the weekend with Abby.

The background is simple. Dad and Sandy met 4 years ago. I met her 3 months after my dad did and Abby like a week later. Abby suffers from nightmares pretty frequently. She would always seek someone out at night when she had them, usually her mom, though sometimes me, and I would always send her to her mom. This has been happening since she was 3.

So my dad and Sandy left Friday afternoon and were gone until Sunday afternoon. Friday night Abby had a nightmare and came to me and asked to sleep in my bed. I sent her back to her room and woke the babysitter who sat with her for a while. Abby was really upset about it and didn’t sleep well that night and didn’t sleep at all Saturday night. When my dad and Sandy got home they were furious with me for not letting Abby sleep with me.

Dad told me he’s aware I don’t see Abby as my sister but wouldn’t I let a small kid sleep with me to help them after a nightmare. I said no. I would not be comfortable with that. He told me it’s something I should get comfortable with for Abby’s sake, so she can have a good brother to rely on. I told him that was not something I was going to work on. That other than Abby I doubt I will ever be asked by a kid unless that kid is my own and that will be different.

Sandy said it was my job to help her kid and that I made last weekend hell for her daughter.

All week dad and Sandy have been pissed about it. My mom died when I was 6 and I don’t have extended family so I haven’t been able to talk about this with anyone.

AITA?