Daisy subsequently moved Amy and her younger brother, John Jr., to Switzerland, where Amy finished high school at the Institut Monte Rosa, Montreux. During this period, Amy learned about her mother's previous marriage to another man in China, of their four children (a son who died as a toddler and three daughters), and how her mother left these children behind in Shanghai. This incident was the basis for Tan's first novel The Joy Luck Club. In 1987, Amy traveled with Daisy to China. There, Amy met her three half-sisters.