Ruth Watanabe Harada is Rachel and Kenji's daughter. She was adopted by a Japanese family because all babies born to leprosy victims are taken away by the government. Ruth has fond and loving memories of her adopted family, and when she meets Rachel late in the novel, she tells Rachel about the hardships she and her adopted family during the forced relocations of Japanese people during World War II. Ruth goes onto develop a close relationship with her birth mother.
Moloka'i