Kidman was born in Honolulu, Hawaii, US. Her father, Dr Antony David Kidman, is a biochemist, clinical psychologist and author, with an office in Lane Cove, Sydney. Her mother, Janelle Ann (née Glenny), is a nursing instructor who edits her husband's books and was a member of the Women's Electoral Lobby. At the time of Nicole Kidman's birth, her father was a visiting fellow at the National Institute of Mental Health of the United States. The family returned to Australia permanently when Kidman was four years old and Kidman's parents now reside on Sydney's North Shore. Kidman has a younger sister, Antonia Kidman, who is a journalist. Kidman attended Lane Cove Public School in her primary school years, and then she attended the North Sydney Girls' High School. She then studied at the Phillip Street Theatre in Sydney, along with her friend Naomi Watts. This was followed by studies at the Australian Theatre for Young People.