Emergency Custody Of My Step Kids

My fiancé got emergency custody of his twins. They are both girls and are 5. The situation is very personal and disturbing. His ex had the kids and her neighbors saw through her window, her doing very inappropriate things with the twins that wouldn't imagine a mother to do. We ended up getting call and had to come get the girls, and mom was arrested. I'm just in a lot of shock because me and there mom actually got along okay. I never knew she was the type to do that type of stuff with her own girl! Her mother has asked to see the kids and my fiancé said they need time to adjust to being with him full time. Her mother is claiming she has postpartum. She recently had another baby who is with the father. I've never heard of postpartum making you do really nasty inappropriate things with your kids. I'm not trying to offend anyone and maybe I'm wrong, but I never heard of that. Either way the girls are safe and happy. Anyway I can make them feel more at home?