Bhumibol and his wife Queen Sirikit have four children:
(Formerly HRH) Princess Ubol Ratana, born 5 April 1951 in Lausanne, Switzerland
HRH Crown Prince Maha Vajiralongkorn, born 28 July 1952
HRH Princess Maha Chakri Sirindhorn, born 2 April 1955
HRH Princess Chulabhorn Walailak, born 4 July 1957