I can’t figure out how to help my little sister without making things worse.

So, for a little background, I am a 20M big brother to a 17F sister, I have since moved away from the situation but it left her behind.

She currently is living with our grandparents (79F and a 81M pretty sure.) and our father (probably like 50??) who is never really around. Fuckers a deadbeat. No mother, she left a long time ago.

Here’s where an issue occurs, besides the overall abuse she’s gone through in the past decade and the sheer amount of blame the old heads put on her, she’s come to me with something that really, really scares me. She tells me that “just being around Grandpa makes me want to cry. I hate being around him, everything he says and does makes me want to get away. I hate him so much I just wish he’d flatline.” Why this worries me is the fact this sounds a whole lot worse than he just hit her or something. Now the guys got a serious case of hotheadedness. Can’t even drop a fork without him screaming about “GOD DAMN CANT YOU FUCKING—“ you get the idea. My point of posting is, I CANT HELP HER. If I call CPS she goes right back to foster. (me and her were in foster for a bit before our father finally got on his feet with our grandparents. It did not go well.) and foster is something I dearly need to avoid. I can’t afford to take care of her either, living penny to penny I have a few dollars to my name after rent, groceries, etc. I’ve tried a kinship thing where I get an allowance from the gov or state, but they rejected me due to my heavy criminal record. (Not touching on that.)

So in close, she’s stuck in a horrible household for another year and a half until she ages out. I feel so helpless everytime she comes to me for help or advice.

This is my last resort, I made a post a while ago on another channel r/trueoffmychest where I go into more detail about the whole situation, but for now, I’d love to hear any possible feedback.