AITA (Fanfic writes)

Am I the asshole for not wanting to babysit my sister's kids?

(Bella Swan x younger sibling)

I, 16 female/male/enby, recently moved in with my dad, Charlie, to finish high school. I have a sister, Bella 19 female, who is married and has an adopted daughter, Renesmee 14 female.

My sister is not in college and is a stay at home mom, while her husband is attending college to be a doctor.

After moving in with my dad, however, Bella has gotten it in her head that I should watch Renesmee while she has 'me time' or runs errands.

I told her the first time that she dropped Renesmee off that I was not going to be watching her nor would I be responsible for her. Bella didn't like this and would instantly drop her off at dad's house after my dad left for work and before I got up for school. This left me with no choice but to watch her as Renesmee was home schooled.

To make matters worse, I don't even like Renesmee. She's a spoiled brat and throws tantrums every time she's told 'no'. She doesn't cook for herself or get herself food and she expects me to wait on her hand and foot as if I'm her servant.

I've missed 15 days of school because of this, and while the school understands my situation it's still going on my record and will make it hard for me to apply for my dream college.

I decided that enough was enough and I told Bella that I would no longer be available to her for babysitting and that if she left Renesmee with me one more time then I would call the cops.

She threw a tantrum then left and the next day Renesmee was waiting impatiently outside for me to let her in.

I kept my word and called the cops before walking outside and leaving for school with Renesmee still standing on the front porch.

I turned my phone off at school like always, but when I was on my way home I found out that I had loads of messages from Bella, my BIL, my dad. When I got home Bella was waiting for me and she went off on me as soon as I walked in.

She called me a stuck up bitch and a selfish asshole for calling the cops and leaving her precious little angel alone. I told her that I had warned her what would happen if she left Renesmee with me again.

I told her that my education was my top priority right now. Not her daughter.

She threw a tantrum and demanded that dad punish me. Dad thinks that I should've just taken Renesmee to keep the peace, but I told him that I now have to attend summer school because of Bella and Renesmee. But my mom got involved and she agrees that should've taken Renesmee in.

So am I wrong here?