. When her parents told Lucy that she was going to have a baby sister, she never imagined that everything would change so much. Discover with Lucy how life is with her naughty little sister Mary. aims to show the values of friendship and family among children through a tender story based on real daily situations which looks to improve their creativity and imagination. is a children's early learning book suitable as a read aloud book for baby, toddler and preschool readers; or a self read book for older children.