I wouldn't worry too much. I know many cases like this where the grandparents get temp. custody as long as the children are flourishing in the home. She isn't doing anything to get better and when you go to court suggest that she take a drug test and they will do that. Keep in contact with CPS worker, that is going to be your new best friend. Anytime she calls you or you know she is doing something she isn't supposed to you call CPS and tell them. They record that and it doesn't look so great in court. If they know the background situation of the children not knowing their father and their mother reaching out to her out of the blue....they will put two and two together. Trust me, work closely with the CPS worker!!!