Title: Kid sister.
Description: Poor Zibby! It's terrible being a kid sister. Ruth and Karen don't even <i>try</i> to understand her. And now they want her to get rid of her wonderful pet rat, Rosemary. 

But before long Zibby finds an unexpected friend - one that likes Rosemary as much as she does.
Subjects: juvenile fiction, juvenile literature, chapter book, pet, rat