Little Timmy and Little Mandy were playing together at the kindergarten.

Timmy says to Mandy, “When we’re older, let’s get married!” Mandy turns to him and says, “I’m sorry Timmy, I like you and all, but I’m not allowed to marry you.” “Why not?” asks Timmy. “Because in my family, we have a tradition of only marrying each other. It’s gone back generations.” Timmy is stunned. “You only marry within your family?” Mandy replies, “Yeah. My mom with my dad, my grandpa with my grandma, my uncle with my aunt…”