Happy Thanksgiving! I do hope that you and your boys have something special planned for today, even though you had your dinner last night. You pretty much guessed why he may not go to his sister's house. He doesn't want to have to deal w/a happy family setting and it's a reminder of what he's done. What better excuse to stay away but a recovery from surgery? Some of them like to play the martyr for attention as well. You know how people will say "poor h, he had surgery and he's at home recovering all alone, etc."
Mlcers tend to go back to the place where it all began. In your h's case, the shore. It's funny how they go back in time right to the place where they were emotionally stunted to begin their journey forward and grow up.
I do hope you were able to get a good night's sleep. Today is a new day and hopefully you will feel much better.
Take care.
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.