It's YOUR parents' house, so I would think that everyone would expect you to be there. If you don't want to be with him, uninvite him. You have more power than your daughter. Or you should.
It won't bother me to have him there, but I assumed it would make him feel uncomfortable if I was there. D8 later told me she invited him on the campout this weekend and he said yes.
Are you saying it would be best to uninvite him? I don't want to disappoint D8 anymore than she has been, but I don't know what the two of us would do for an entire weekend in the wilderness together either.