A young boys logic

Boy aged 4: Dad, I’ve decided to get married.

Dad: Wonderful; do you have a girl in mind?

Boy: Yes… grandma! She said she loves me, I love her, too… and she’s the best cook and story teller in the whole world!

Dad: That’s nice, but we have a small problem there!

Boy: What problem?!

Dad: She happens to be my mother. How can you marry my mother!

Boy: Why not?! You married mine!