A need to protect and Love for a child that isn’t your own.

I’m just wondering if anyone who has a child not their own in their care that has been removed from the department that they have ended up being able to be the carer/guardian forever. Let’s call the child billy I know children have the right to know their parents and siblings and I’m not suggesting all contact stopped for good I’m just so invested and care for the child like billy is my own. Billys been through some pretty horrific stuff but there is still a chance billy may go home. This thought scares me and breaks my heart. This is due to Billy’s reactions around contact with family. A paediatrician has said Billy’s emotional, physical, family bond/bond with mother especially and educational difficulties are more than likely due to neglect given billy has improved over time with me. There is sexual assaults etc and we have issues with this but are making progress. Billy has been removed from somewhere that was horrible for any person let alone a small child. Billy’s been placed in a “normal” Home and has come such a long way and there is a chance this “normal” life will be ripped from billy to be placed back where Billy’s life was traumatic. We’ve formed such a bond with each other which is stronger than the bond billy has with Billy’s own mother and Billy’s bond with my own child is stronger than the bond with Billy’s own siblings. Billy has been noted to be on the outs at visits and spends the time on Billy’s own and not interacting much. I just feel like Billy’s best interests wouldn’t be to put billy back into that environment. Family is important and contact would still be something but even now visits aren’t in Billy’s best interests and the impact it has is crazy. Why is it that parents who clearly can’t look after their child still get to have chances. I know some people can change but some things are just way too much for them to be considered to be able to have their child back. Like knowing about sexual assaults on your own child and saying they aren’t in danger is crazy and even letting your own child do things to you. Surely there should be somewhere they draw the line and decide that a child shouldn’t be returned. Sure some parenting things can be changed with assistance but surely a child’s well being is more important than the parents need to have them. Like I’ve been made to do phone contact to make Mum feel better. These were the exact words used. Seriously though it’s not about her. It’s about the child. I’m just so frustrated with the system and can’t seem to process how they can think it’s in the best interest of children sometimes. I’m no amazing parent who doesn’t do anything wrong. I make mistakes, my house gets messy but my children come first and always will. They don’t go without and they couldn’t ask for anything. We go on outings, we laugh, we have family time etc but I’d never ever put my child in danger and I’d never know about something ao serious and think it’s ok. I’m just so scared for where billy will end up and the life he will have to have if he is returned home.