Let him stay where he is. My late husband had a similar situation, only his father suddenly decided to get in touch with him. It was in the early 70s, and my husband was in his late twenties, he was torn between anger and delight, many letters were exchanged, the missing father having emigrated to Canada, having also left his second family. There was no hands-on contact, so to speak. Then came the exchange of photos; shock horror - husband had hair that passed his collar! Absent Father backed off as quickly as he'd re-appeared. How, he had asked, could he introduce his son to his new redneck friends when he looked like a skid row bum? He wasn't interested that his son was a talented musician, clever, funny, and hard working. You would have imagined that this would have been the final insult and rejection, wouldn't you? There was more to come, about ten years later there was a letter from a Canadian lawyer, Absent Father had died of lung cancer, and one of his final acts had been to instruct his lawyer to send a copy of his will to my husband, where he had made a point of stating that no part of his estate should go to his only son. Let your father stay exactly where he is. He doesn't even deserve to have you tell him what a toe-rag he is.