The Goody by Lauren Child

Chirton Krauss is a good child - the very goodest. He does everything he is told, when he is told. He even does good things without being told. He eats his broccoli, he goes to bed on time and he never, ever sticks his finger up his nose. Meanwhile, Chirton's sister, Myrtle, is not a good child. She stays up late, she never cleans out the rabbit's hutch and she drops her choco puffs all over the carpet! But what will happen when Chirton Krauss decides that being the 'goody' isn't so good after all?