When Kristy gets a regular sitting job at the Kilbourne house, she has to wonder: Doesn't Shannon Kilbourne, associate member of the BSC have time to take care of her own sisters? The answer, unfortunately, is "no." Shannon is too busy to deal with her sisters. But they will not be ignored. First, Tiffany and Maria try to help Shannon--by "cleaning" her room and "correcting" her algebra homework. When this doesn't work, Tiffany and Maria decide to make Shannon's life harder. Can Kristy manage to forge a truce--or will the Sister War rage out of control?