You're beautiful

"Sissy, you're beautiful," said Lydia to her big sister.
"Nora, you're beautiful," Lydia continued as she held her baby sister's hand.
"Mommy, you're beautiful."
"Awwww, that's sweet, Lydia," said Mommy, filled with pride.
"Well, Mommy," explained Lydia, "You're a pain in the butt."
And, away walked Miss Sassy Pants.