D., I understand. I think that what you should consider is working out a schedule. Your Thanksgiving dinner can be a different time than theirs. Kids have to eat 3 meals a day - let them have either the lunch or the dinner with you. Tell the family this. If you can be flexible, then that's great.
If they have, say, a 2:00 lunch, then send the kids after breakfast, let them eat, and then pick them up to spend dinner with you.
Perhaps you could stand to spend an hour with them at Christmas around your other activities?
I don't know anything about the circumstances or reasons for his suicide, but it appears that they aren't blaming you for it. Be grateful for that, considering you mention that "all of a sudden, I am no longer the bad guy and am welcome". It could have easily been one of those awful family situations where someone starts screaming that around. So, I think maybe it would be nice to try to visit them a little.
I hope you all get through the coming holidays.
Dawn