Marion finally gets to babysit her little sister Gabby in the twelfth book of The Critter Club series! Marion has always wanted to babysit her sister–but her parents have said she is too young! When they finally ask Marion to watch Gabby during a party at their house, Marion can’t wait! But she quickly finds out that babysitting isn’t as easy as it looks. Gabby won’t listen to Marion at all. After getting upset about losing a board game, she makes a total mess and even draws on the table! When Marion gets called to the Critter Club to help out with a run-away cat, Gabby tags along and causes even more trouble! Maybe being a sister is better than being a sitter…