If I were you, I wouldn't ask the question. Him being a negative person, it's probably not good to make him feel worse about having to give an answer. It's really better to just move forward, and set up a time you could meet for lunch, go to a football/basketball/whatever game, play some golf, whatever. Better late than never to bond with your dad.
Good luck!
Well, he still lives in Texas, so face to face stuff will be difficult.