There is a group of old NY Giants fans (I believe they are called the New York Giants Historical Society, but I might be wrong) who still get together a couple of times a year and talk about the old days in baseball and all that. Have you or your father ever heard about them? I know some of the ownership in the current Giants organization have spoken at their meetings and have tried to bridge the gap between the NY and SF fans. Apparently they are similar to your father and never forgave the Giants for moving. I don't blame him.
"There's never enough time to do all the nothing you want." -Calvin and Hobbes