Honestly man, what would you say to him if you were to meet him? Do you think he would actually be happy to see you? You may end up causing problems with his current family because his new wife and kids may have no idea he had another child. He could get extremely angry. I really don't think you've thought this through very well. Biologically he's your father, yes, but in an emotional sense, which, BTW, is actually the important part, he's nothing, and to him, you are the same.