Father: “That’s great, son! Who is she?” Son: “It’s Sandra, the neighbor’s daughter.” Father: “Ohhh, I wish you hadn’t said that. I have to tell you something, son, but you must promise not to tell your mother. Sandra is actually your sister.”

The boy is naturally bummed out, but a couple of months later: Son: “Daddy, I fell in love again and she is even hotter!” Father: “That’s great, son! Who is she?” Son: “It’s Angela, the other neighbor’s daughter.” Father: “Ohhh, I wish you hadn’t said that.

Angela is also your sister. ”This went on a few more times, and finally the son was so mad, he went straight to his mother crying. Son: “Mom, I am so mad at dad! I fell in love with six girls and I can’t date any of them because dad is their father!

”The mother hugs him affectionately and says, “You can date whoever you want. He isn’t your father!”