Bigmama's by Donald Crews is a picture book memoir of his childhood summers at his grandparent's farm in Cottonwood Florida. He rode the train there with his three siblings and mother. The home was old with no indoor plumbing, numerous farm animals to care fore, and lots and lots of places to explore.
As the focus is on his nostalgic feelings of anticipation and excitement, the historical context is left in the background. On the train they sit in the colored car, for instance. The lack of modern conveniences in Bigmama's farm (even 1950s /1960s versions) are another sign.
But mostly this book is about the joy of family coming together. It's about smiling children. It about grandparents cooking for their family. The smiling here, then, is genuine.