I am so sorry for all that you have been through. I can't even imagine just how traumatic this has been for all of you. Your frustration and resentment is totally understandable. I wish I could offer you more help and advice but the best thing I can do is share advice that I received. Both my gliders started out extremely crabby and nippy. I spent many nights in tears thinking we would never bond. Just as I was about to give up and rehome my first one, someone said to me "be patient, it will get better". Well, as far as I was concerned, I WAS patient...extremely patient! I didn't know what else I could do. But she was absolutely right. I kept doing what I was doing....loving them unconditionally, speaking softly and calmly to them, keeping them in their bonding pouch as much as possible, offering treats, and working to gain their trust. It was slow going but absolutely worth every second. A firm "no bite" or "psst" sound usually deters them from biting. Consistency is so important. Separating them at times and having some one on one time might help too. I would also suggest taking them to the vet for wellness checks to make sure they are healthy. The vet would likely have some advice for you as well. Do the best you can. It's obvious you love your gliders and they will feel that from you. I wish you the very best. Please take care and keep us posted.