Abby Hunter's parents are out of town, and Grandma Hunter has come to take care of Abby, Carly, Shawn, and Jimmy.

All goes well until Granny Mae shows up, too. She's quite sure that Grandma Hunter needs some help. And the fun begins!

Grandma Hunter is strict and careful. Granny Mae is relaxed and "cool." Will Abby's very opposite grannies be able to get along? The whole cul-de-sac learns a lesson they'll never forget!