Dating

A guy went up to his father saying : Daddy , I fell in love and want to date this awesome girl !

Father : That's great son , Who is it ? ...

Son : Its Sandra , the neighbour's daughter

Father : Ohh ! 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 naturally bummed out, but life goes on and indeed a couple of months later

Son: Daddy, I fell in love again and she is even hotter!

Father : Thats great son who is it ?

Son : Its Angela , the other neighbours daughter

Father : Ohhh ! I wish you hadn't said that . Angela is also your sister This went on couple of times and the son was mad, he went straight to his mother crying

Son : Mom, I am so mad at dad ! I fell in love with six gals but i cant date any of them. Because dad is their father

The mother hugs him affectionately and said : My son , you can date whomever you want, He isn't' your father .