Does anyone else have a parent-figure sibling?

I'm 14M and my older brother is 22, while our sister is 23. No, our parents didn't die. My father is an overseas worker so he isn't around often while our moms an abusive woman. She's likes to appear as the perfect mother when outside but when at home, she's horrid. At first, I disliked my sister because of what mom told me about her: selfish, rude, and doesn't care about the family while my brother is a lazy good for nothing, and just as self-serving.

Eventually, at 18, my sister got a scholarship abroad with a generous stipend and left. After graduating, my brother followed her. I was left alone with mom. When I turned 11, my mom had a burst of anger when I told her that I would like to become an artist. She broke my tablet and kept cursing before leaving for work. She ignored me for weeks so my grandma was the one who ended up giving me money for food and a lunch for school. She returned to normal but started to be more mean.

While staying at my grans place, my gran video chatted my sister. She and my brother look healthier than before, and that's understandable since I haven't seen her since I was 9. Neither of them even post much. After they finished talking, my gran told her about what happened at home so she asked me if I want to live with them in that country. Blabla, she's a good liar, convinced my mom to let me go to find "better opportunities" and stuff so I went. To be honest, I didn't expect her to be hardworking and soft-spoken because of what mom told me, and the same goes for my brother (except he's not soft-spoken). Sis funds our studies now while maintaining her scholarship and the household with my brother. They even have part-time jobs for extra money. Our papa visits us when his ship is docked in the country we are in, and we just chat mom regularly to avoid issues. I want to repay my siblings somehow, especially our sister. Next mother's day, I'll be sure to give her a present... oh wow, this is long.
Does anyone else have a parent-figure sibling?
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