The megahit series returns to charm and inspire a new generation of baby-sitters!

When Claudia's beloved grandmother, Mimi, has a stroke, it changes everything. Instead of spending the summer baby-sitting, Claudia is Mimi-sitting. She could use a little help, but her impossible sister, Janine, just can't be bothered. Claudia is trying hard to be nice -- but Janine is just so mean!