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The original was posted on /r/AmItheAsshole by /u/DeepGrief52 on 2023-10-01 06:39:14.
I (f32) live in a European country, I won't say which for privacy. When I was 6 my mother died in a car accident, he grieved heavily, but eventually he moved on, he remarried when I was 11 to "Mia" who had a daughter from her previous marriage "Zani;" Zani's father died of stage 4 pancreatic cancer, very rapid onset. Which was why my father and Mia bonded very quickly.
It was hard for m e, but I accepted the family blending, I thought it could only help after the void my mother left. However soon it became clear who was the favorite. Zani was the golden child, my dad was really vulnerable after my mom passed, he always gave the benefit of the doubt to Zani. She could throw tantrums and cry for whatever she wanted. I was never really neglected but whenever their was a judgment I was on trial as a girl who should do better and she was a poor victim who lost a parent. As if I didn't either.
Fast forward I got into college on a scholarship, and I lucked into a job because of one of my summer internships. Thanks to that connection I was able to get a decent apartment in my city. I was LC with my parents recently but I wanted to tell them I got my own place. They seemed really pleased with me. Then I got a call from Mia about how I have such an amazing place in our city (it's not amazing just a decent part of the city) and how I must have so much space. I tried to respond noncomitally but she started to insist Zani could stay there for a few days and I could help watch her kid. Apparently Zani had a baby recently but as the child grew it was clear her husband was not the father . She said it was the right thing to let her stay over, but I said no, I wasn't equipped for that and I can't be expected to take care of a an 8 months old She started screaming at me saying how we were family and this what you're supposed to do but I hung up.
My parents called a few times, but I left them to voicemail.. AITA for not letting my sister stay with me? I just don't feel I should automatically give in
EDIT: I should explain Mia cannot take Zani in because because Zani is an addict and Mia uses benzos on prescription.