Princess Margrethe of Denmark and Prince Henrik with their son Prince Frederik at Amalienborg Palace in Copenhagen in 1968. (Photo by Keystone/Getty Images)
Princess Margrethe of Denmark and her husband Prince Henrik with their children Princes Frederik and Joachim during a visit to Greenland in 1970. (Photo by Keystone/Getty Images)
Queen Margrethe of Denmark with her son Prince Frederik on holiday in Megene, France in 1973. (Photo by Keystone/Getty Images)
Queen Margrethe of Denmark and her husband Prince Henrik on a visit to the Virgin Islands with their children Princes Frederik and Joachim on June 02, 1976. (Photo by Keystone/Getty Images)
