One-upsmanship

So Margie was watching Katherine on the playground after preschool. There was a little boy there who started yelling to Katherine, for reasons unknown, “My Mommy is better than yours! My little sister is better than yours!”

Katherine got very indignant. She drew herself up, and shouted, “My Mommy is better!”

Then turned to Margie and shouted, “And I still want a little sister!”