Touchy subject. We're married/separated. We've always had Thanksgiving dinner as a family, at my parents' home. He has no family (I disowned my in-laws 7yrs ago as they continued to enable his behavior when he would take off, and they in turn disowned him when he came back to me, etc) and no friends that I know of that he would be spending the holiday with. The empath in me feels horrible about leaving him out in the cold on the holidays.
To invite or not to invite? I don't mind him coming as he likes to put on his nice-person show around my parents so it would be pleasant, and nice for the kids, but my common sense says NC/MC is NC/MC and that I should rather be enforcing that. That he shouldn't get the privilege of being thought of at family holidays just as he didn't think of anyone else (including his children) during the other times of the year... I am usually a very sympathetic person and while I don't want to be vindictive, I do want him to suffer the consequences of his actions sometimes.