The Baileys' decide to adopt a little girl one year younger than the triplets, who has lived in foster homes all of her life. Consequently, they discover she has terrible manners from living with the sleazy Whysalooskies. At the Triplets birthday skating party, and later at dinner, their Grammy witnesses her ill manners firsthand and proposes a strange hysterical ripsnorting plan to change her behavior. She learns proper etiquette and they grow to love her even more.