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The original was posted on /r/AmItheAsshole by /u/Inner-Respond-6427 on 2023-09-06 00:51:31.

I feel really bad and need an unbiased opinion.

I (28f) am currently living with my sister (32f) and my niece who is 5 months old. My sister asked me to move in with her as she was separating from her partner and needed someone to help with the bills. I cover the majority of rent payments for the house and bills since my sister is not fully back to work yet. On the days she is working it is usually our mother who looks after my niece.

Now I mainly work from home and due to how loud both my niece and my sister are and the job specifics I wear good noise cancelling headphones (I also have a room with my own bathroom). I have told my sister multiple times if she needs anything and I haven’t responded to a knock she needs to come into my room and tap me to get my attention otherwise I would simply won’t hear her and wouldn’t know if she needs anything. However my sister keeps forgetting it.

Last Friday was very hectic at my work so I ended up working 12 hours and had some snacks to get me going. I had no knowledge of my sister asking anything of me since I sit opposite the door I also haven’t seen her coming into my room since she didn’t tap me on my shoulder as we agreed. Apparently she had to run a few errands at work and had noone to leave my niece with and decided to leave her with me since she would be a few hours. Because I had no idea of her plans and she hasn’t followed what I have asked her to do, my niece was left unattended for over 3 hours and was crying her eyes out for god knows how long. I only found out about it when my sister returned home (I was still working and had my headphones on) as she ripped the headphones off my head and started shouting at me and calling me an asshole for not attending to my niece, even I have explained to her I had no idea she was gone or my niece was crying (to add, I don’t look at my phone during work hours and after I have checked there was no messages or missed calls from my sister)

I feel really bad about the entire situation, so wanted to check if I am an asshole as my sister still wouldn’t talk to me and makes it sound like I did it on purpose.