Because it is a family event, I would offer up an invitation and let him decide if he wants to come or not.

I would phrase the invitation something like this: "h, we are planning to celebrate Thanksgiving at such and such time. If you would like to come, you are more than welcome." You leave it in his ball park to either accept or decline.

I seriously doubt that he would ask. I would invite him next weekend and leave it up to him w/no expectations.

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.