Is it possible to obtain custody of a non-relative child that is in foster care?

My “friend”, lost custody of her 3 children a year ago. They have been in foster care ever since. I was very very involved in the girls lives and did more raising than their parents did, from the time they were born. They have no other family that was involved with them on a regular basis, and none of them can afford to support 3 children. The kids know me as their aunt. The current foster home they are in is very sketchy. 8 foster kids share one room. What do I need to do to try to obtain custody of them? Is it even possible? The foster home is non adoptive. The father is in jail on charges of sexual abuse towards the kids, they were removed from mom for breaking the safety plan and letting them talk to him after they were given back the first time they were taken, and I made the call to report she was breaking the safety plan. The girls are in GA but I moved to FL 8 months ago for a better job, but would be willing to relocate back to GA to try and get them if necessary.