His Majesty King Bhumibol Adulyadej was born at Mount Auburn Hospital in Cambridge, Massachusetts in the United States of America, at 8.45 a.m. on Monday 5th December 1927. He was the younger son of HRH Prince Mahidol Adulyadej and Mom Sangwal. King Bhumibol has one elder sister and one elder brother: the late Her Royal Highness Princess Galyani Vadhana and His Majesty King Ananda Mahidol.