As Tad has indicated in his signature line, he has been divorced since 2011 and his xw remarried in 2013. As for the kids, they are grown men working and living their own lives now. It is up to his sons to decide whether to have a relationship w/their mother or not. It's not Tad's responsibility to build a bridge of communication between his sons and his xw. If anyone should be building that bridge, it should be his xw. She left them.
Tad has had a very difficult journey and continues to have good and bad days. He is doing the best he can for himself and right now, he's got enough on his plate just taking care of himself. As for reconciling, this may or may not ever take place...but that will be up to Tad if this situation should ever present itself to him. However, I do not think it's Tad's place to ask her to come back, i.e., she walked and if she wants back, she would have to earn his trust and respect and I don't see that happening any time soon.
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.