Who's Your Daddy One Sunday morning, William burst into the living room and said, "Dad! Mom! I have some great news for you! I am getting married to the most beautiful girl in town. She lives a block away, and her name is Susan." After dinner, William's dad took him aside. "Son, I have to talk with you. Your mother and I have been married for thirty years. She's a wonderful wife, but she has never offered much excitement in the bedroom, so I used to fool around with women a lot. Susan is actually your half-sister, and I'm afraid you can't marry her." William was heartbroken. After eight months, he eventually started dating girls again. A year later, he came home and very proudly announced, "Diane said yes! We're getting married in June." Again, his father insisted on a private conversation and broke the sad news. "Diane is your half-sister too, William. I'm awfully sorry about this." William was furious! He finally decided to go to his mother with the news. "Dad has done so much harm. I guess I'm never going to get married," he complained. "Every time I fall in love, Dad tells me the girl is my half-sister." His mother just shook her head. "Don't pay any attention to what he says, dear. He's not your real father."