Starting this off by saying I was 14 when this all started. I am now 17, and I still despise this woman.
My freshmen year of high-school, I lost my grandma who was my best friend. It was a time we knew were coming. I was distraught and stopped caring for school, and just as I started to relax my dad started talking to me about him having a girlfriend. (My parents have been divorced since I was 1, and my dad lived with my grandma) I didn't care much for the idea, but he should be allowed to live his life. He knows I hate change and started to tell me about his girlfriend and her kids moving into the house, but it would be sometime next year. Okay, no problem. Though their house ended up flooding and they quickly moved into my now dad's house. Two weeks after they settled in, my grandmother's house was filled with boxes, animal shit, and her stuff everywhere. Her house was covered in antiques, that were meant to be mine. Most of them were ruined or missing parts. This hit hard for me, and I was meeting three new people and about 5 new dogs and 3 cats. What hurt the most was his new "daughter" that was a few years older than me had taken my grandmas doll room and turned it into her room. It was filled with MY childhood stuff, and when I told them I didn't like it, they ignored me.

What pissed me off the most is they rehomed my grandma's cat to my brother who was clearly grieving his only owner, had everything flipped upside down then forced into a home with a 4-year-old child that loved pets. Back to main topic. She had this immediate motherly care for me, I love my mom deeply, and she smothered me in attention I didn't want. A few months later, I learned my dad had been going to Mississippi randomly and he never told me. I learned because I would drive to his house after begging my mother and was met to nothing. Apparently, his fiancé picked up on me talking poorly about my father due to her daughter. She messaged me and started to talk on how wonderful I was, and how much they loved me. I was pissed and told her to back off of the situation, as it is not her business what happens with me and my dad. My dad is a raging alcoholic, and she insisted he changed. Even saying that I was the reason he was hurting. I lashed out even more and explained how my dad had messed up my childhood. She stopped messaging then told us I needed to call them so we can talk. I told her that I won't call, that it's a 20-minute drive at WORST to my house and pray that I answer the door. She told me how rude I was. This was back n fourth for a while. when my bio-brother learned he tried to explain my side to her. Instead, she told him how he "ruined" his life by picking to raise his daughter and not going to college.
I can't remember what else she's done but I know she would also demand I go off of my medications and just take weed to solve my issues. My mother paid for my medication, they never even tried to go to my medical appointments or even pay for them. Never has she apologized for this, and it's a massive grudge I hold even now. There are other situations with my dad's new family, which is why I dislike them, but this post is massive. AITA?