I am sorry that he has been released, I am sure that is a terrible anxiety for you! Maybe you should cut down on contact with his family for a bit if you feel they are planning anything. Maybe she didn't know that he was released. I do not know how your relationship is with her, could you ask her, or is it better not to confront her?
I hope that your family will be safe, and that your adoption goes quicky and smoothly!
Julie
http://stepparent.adoptionblogs.com/