Ramona and Her Father by Beverly Cleary

Ramona just wants everyone to be happy. If only her father would smile and joke again, her mother would look less worried, her sister would be cheerful, and Picky-picky would eat his cat-food. But Ramona's father has lost his job, and nobody in the Quimby household is in a very good mood.

Ramona tries to cheer up the family as only Ramona can -- by rehearsing for life as a rich and famous star of television commercials, for instance -- but her best efforts only make things worse. Her sister, Beezus, calls her a, pest, her parents lose patience with her, and her teacher claims she's forgotten her- manners. But when her father admits he wouldn't trade her for a million dollars, Ramona knows everything is going to work out fine in the end.