for Sourpuss and Sweetie Pie by Norton Juster and Chris Raschka
In this sequel to the Caldecott Medal-winning "The Hello, Goodbye Window," Nanna and Poppy are expecting their granddaughter to visit, but which one will it be? Most of the time she's Sweetie Pie, other times she's Sourpuss, and then sometimes she's both at once. Full color.
Publisher description retrieved from Google Books.