My nieces are being neglected

They already got reported by a family member to an agency that supposed to help abused children but they deemed their situation safe enough to not intervene. I have two nieces, one just turned 13 years old a month ago (name her Zoe) and another who is 2 months old (name her Hannah) . Their mother, my sister (name her Maryn), does not work and relies on others for money. I think they said she uses the government money she gets from Zoe (maybe idk?). She lives with her mother still and my sister is about 40! We have different mothers, by the way, and I have no contact with her mother. She’s waiting for her to die to take over her house. An important note is that my sister and nieces live almost 10 hours away.

Zoe was born with autism. Shes been bullied at school pretty heavily and expelled for extreme actions. She’s at a VERY low educational level and she’s in some online school that she actually doesn’t pay attention to. Apparently , many teachers quit helping her and she was rotating teachers. She was given a phone at a young age, shes talked to older men, took inappropriate photos and sent them, talked to strangers all before she turned 10. Obviously, me and my cousin told her mother when we found out, but she took her phone away but gave it back not too long after. My parents bought her a new phone (i begged them not to), they were pretty oblivious to what she was doing with it, but they were trying to make her feel better since her mother cant afford gifts. It’s been a pattern of it happening and today I discovered a tiktok page with her swearing like crazy “fuck this.. fuck these people”, etc. I showed my parents and they felt helpless, they are afraid to take her phone because Zoe actually has a high chance or hurting herself or her sister Hannah in retaliation . Zoe called my parents crying saying she’s hearing voices telling her to hurt herself.. She’s threatened her own life multiple times, and Maryn had the AUDACITY to dare her to do it! My sister Maryn knows what she also does but does not regulate it or anything. She doesn’t parent or do actually anything! Zoe was caught sneaking out at 12 to meet with boys, and it wasn’t Maryn who caught her, it was another sibling.

Maryn has a boyfriend who is actually a horrible man who had another child with a woman. He didn’t raise that child at all. That woman raised him for years and then he was gone to another man who SA’d him. and that child was convicted at 12 for touching a little boy inappropriately and now he’s living around, hes almost an adult by now. That boyfriend is also not around for Zoe or Hannah. I dont even know why my sister let this man get her pregnant TWICE. Hes just gotten in trouble with the law again and hes lucky hes not in prison.

Lastly, Hannah was born with SCD . This news broke everyone’s heart because of the disease itself and that my sister already is a terrible mother and Zoe was already known to be too rough with babies and children. I just watched a video of Zoe making the baby dance for a tiktok video. The major problems were she was shaking the baby WAY too much, not supporting the babies head, flipping the baby around. For some reason she was making the baby twerk for a song, it was VERY weird. Again, Hannah is 2 months old. Maryn sent the video like it was fun and cute? The baby could have lasting injuries from shaken baby syndrome because of how aggressive Zoe is being!! I hope it’s not being amplified because of her SCD as well! Knowing Zoe and Maryn, this is not going to stop.

Lastly, i cant blame Zoe for her behavior now. Its all her mothers fault, i just hope she can change her behavior before its too late. My parents said they cant do anything until it’s too late since that agency deemed their situation safe. I dont want to watch Hannah live a life of suffering, or go down the same path Zoe does. Zoe’s mental health is bad and she’s making bad decisions at such a young age, its terrible to watch. I don’t want her to take her or Hannahs life. Maryn could actually care less. Im watching this happen from far away but if there’s anything i can do, i need to know. Any suggestions about what i can do to help my nieces?