I'm glad to see that your h attended the AA meeting. It will give him something to think about and hopefully decide to have a sponsor work w/him.
So, when will you and your lawyer (father) meeting w/your h and his lawyer? After a few meetings, don't be surprised if he raises that question to you.
Please keep your expectations at zero and I do have to agree w/the other poster...this isn't romantic, but serious business. Time will tell if he will continue going or if he's just doing this to get you to attend the meeting and move forward w/a divorce.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.