Need a baby-sitter? Save time! Call: The Baby-Sitters Club. Claudia's sister Janine is too busy being smart to be nice to anyone, even their grandmother Mimi. But Claudia doesn't have to see Janine too much this summer since the Baby-Sitter's Club is starting a new play group. It's going to be so much fun! But then Mimi has a stroke and the whole summer changes. Now Claudia is 'Mimi-sitting' and Janine is no help at all. How can the Kishi sisters get along when Janine is always so mean?