15 Year Old Sister Trapped As A Babysitter For My Biological Mom

Location: Alabama.

Yeah as the title says my 15 year old sister is trapped within my biological mom's home to be a babysitter. This has caused issues such as suicidal tendencies, self harm, truancy within school, lack of self esteem, ect. She involves herself with drugs and she does vape. I was fortunate enough to have been near turning 17 by the time I asked my mother to move out (She allowed me cause I kept pushing and she had my other siblings who ended up also moving out to watch the kids) and live with my aunt in Wisconsin. While it sucked to leave her behind and what I knew, I became a lot better from it and I'm currently applying for colleges.

I have pictures of the state of the house, it's always a mess and it's a lot harder on my sister because 2 of the kids have confirmed autism. I think one of them are on their way to being diagnosed with it as well. Both of my parents work because while government assistance is provided, my biological mom can't afford the mortage. She has 4 little ones who cannot be left alone and one of them is an infant she just had in August of last year. I have another sibling who is in the 3rd grade and she talks sometimes about how stressed out she is when she has to be a babysitter as well and discusses hurting herself.

The 3 young children don't even have 4 walls of a room, the reside in a living room style area that's right by the front door.

My 15 year old sister gets her therapist through the school she is enrolled in but she can no longer receive that form of help due to my mom pulling her out of it to watch the kids. She will be "homeschooled" but she needs proper structure and she's not gonna have motivation to do it if she's a full time mom basically. My 15 year old sister has had numerous mental hospital visits and has self harm scars all over her arms from this stress and yet nothing has been done about it.

My mother does not deserve these kids neither does my father. He's had an unregistered firearm incident happen where he directly threatened my brother but nothing was done due to my father having a history of Repossessing vehicles so he built a relationship with some law enforcement. He beats on the children and yells at them, he does not parent them at all and it's just a whole plethora of issues.

I want to help my sister get out of this mess but I can't have this traced back to me and I'm at a loss for what to do. I am 18F and my aunt and uncle really want to provide assistance but my aunt is at risk of my biological mom completely cutting my sister from contacting her if she does anything so I'm kind of left to at least try and make some sort of movement happen.