Pre-Adoptive Foster Child...Need advice?

I did foster/adopt but my kids were older. With my first 2 placements (bio brothers), I kept adoption open with bio mom. She backed off. 3rd and 4th placements (bio brothers also), came with bio parents having been TPR'd. Boys were 6 and 8 when they came home but they had anger issues. I was able to get in touch with bio mom. They knew we were in touch but she didn't see them until they became teenagers. It's going to be hard because the child will always love his or her birth mother. Keep it open but set boundaries. If the issues continue, you can stop contact but don't you be the one to stop contact. Hope this helps.