Son : Daddy, I fell in love & want to date this awesome girl. Father : That's great son. Who is she? Son : It's Sandra, the neighbour's daughter. Father : Ohhh I wish u hadn't said that. I have to tell u something son, but u must promise not to tell ur mother. Sandra is actually ur sister. The boy is naturally bummed out; but a couple of months later : Son : Daddy, I fell in love again n she is even hotter! Father : That's great son. Who is she? Son : It's Angela, the other neighbour's daughter. Father : Ohhhh I wish u hadn't said that. Angela is also ur sister. This went on couple of times nd son was so mad, he went straight to his mother crying. Son : Mum 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 : My love, u can date whoever u want. He isn't your Father..!!