Thinking ahead

I may be getting the cart before the horse, but I like to be prepared. We are adopting 3 siblings through CPS. It is straight adoption, they move in in a couple of weeks and then 6 months later we will finalize the adoption. So here are my questions: 1) They have an aunt that is still in their life, I've talked to her and like her. I want to keep her in their lives and she wants to continue their relationship. I think I can trust her, based on her behavior so far with the foster mom - CPS is not involved in allowing her visits at this point. What should I be considering with this relationship other than how often contact and what type of contact? 2) Through the aunt, I know mom is clean and in a safe place. The oldest child really worries about his mom. Should I let him know that she is getting better and has a good place to live now? Do I tell him? Tell his therapist? If I tell, when? His latest psch eval shows he really worries about her. 3) Should I initiate contact with mom to let her know her kids are loved and doing well? I don't want to do it in a way that she knows our names or where we live. She knows they are being adopted, but doesn't know exactly when or any details. TPR was almost a year ago. I am considering a fb account that does not include my name and friend the aunt and possibly mom to share photos. How long do I wait to do this? The oldest remembers his mom and I'm sure will probably want to make contact again one day. He's already asked about this. I want to have the answers for him. I know these are long range questions for us, but once they get here I may not have time to ask. Thanks.