The Casson Family Series is a collection of children's books written by author Hilary McKay. The series follows the lives of the quirky and lovable Casson family, which includes parents Bill and Eve, and their three children: Caddy, Rose, and Ben. Each book explores the family's everyday adventures, relationships, and challenges, often infused with humor and warmth. The series consists of several titles, including Saffy's Angel, Indigo's Star, and Permanent Rose. These stories highlight themes of friendship, creativity, and the importance of family bonds. The books are well-loved for their relatable characters and engaging storytelling, making them popular among young readers.