In 1971, Obama returned to Honolulu to live with his maternal grandparents, Madelyn and Stanley Dunham. He attended Punahou School—a private college preparatory school—with the aid of a scholarship from fifth grade until he graduated from high school in 1979. In high school, Obama continued to use the nickname "Barry" which he kept until making a visit to Kenya in 1980. Obama lived with his mother and half-sister, Maya Soetoro, in Hawaii for three years from 1972 to 1975 while his mother was a graduate student in anthropology at the University of Hawaii. Obama chose to stay in Hawaii when his mother and half-sister returned to Indonesia in 1975, so his mother could begin anthropology field work. His mother spent most of the next two decades in Indonesia, divorcing Lolo Soetoro in 1980 and earning a PhD degree in 1992, before dying in 1995 in Hawaii following unsuccessful treatment for ovarian and uterine cancer.