A young boy goes to his father and says “Dad, I fell in love and want to date this awesome girl!
The father replies, “That’s great son. Who is she?”
“It’s Sandra, the neighbor’s daughter”
“Ohhh I wish you hadn’t said that. I have to tell u something son, but you must promise not to tell your mother. Sandra is actually your sister.
A short time later the son goes back to his father, “Daddy, I fell in love again and she is even hotter!”
“That’s great son. Who is she?”
“It’s Angela, the other neighbor’s daughter.”
“Ohhhh I wish you hadn’t said that. Angela is also your sister.”
This went on couple of times and the son was so mad, he went straight to his mother crying.
“Mom I am so mad at dad! I fell in love with six girls but I can’t date any of them because dad is their father!”
The mother hugs him affectionately and says: “Oh son, you can date whoever you want. Don’t listen to him, He isn’t your father.”