Good news, Ginny! Proceed with caution, but I'm so happy for you!
Bopeep, your son's behavior is very confusing. I agree w/ Dolcecatte that he probably didn't mean to signal a full reconciliation. There may be some differences between him and dil as to how far they want to take this, also. So those may be the reasons you're not getting any response to your efforts. But it means you're getting mixed messages, and that's not fair to you. I'm so sorry. Still, I feel you should back off and see if and when he makes another move. Be patient.
Crazy, I'm so sorry, about your son's reluctance to do anything. Yes, he may need to check with dil before making any plans. But, imo, he should check with her and get back to you, not tell you to check with her. Tbf, he probably thinks his way is easier, but I understand that it isn't. If you do talk to dil, can you ask her to give you a few dates that they're free for you to choose from? If she says, "We're never free," then you know that's that and you tried. But maybe you'll be pleasantly surprised. I'm glad you appreciate your time with your other gc and, basically, like your attitude.