Princess Marina, Duchess of Kent was a Greek princess by birth and a British princess by marriage. She was a daughter of Prince Nicholas of Greece and Denmark and Grand Duchess Elena Vladimirovna of Russia, and a granddaughter of King George I and Queen Olga of Greece. Princess Marina married Prince George, Duke of Kent, fourth son of King George V and Queen Mary, in 1934. They had three children: Prince Edward, Princess Alexandra, and Prince Michael.

Princess Alexandra, The Honourable Lady Ogilvy, is a member of the British royal family. The only daughter of Prince George, Duke of Kent, and Princess Marina of Greece and Denmark, she is a granddaughter of George V, niece of Edward VIII and George VI, and first cousin of Elizabeth II. Alexandra's mother was also a first cousin of Prince Philip, Duke of Edinburgh, consort of Elizabeth II, making her both a second cousin and first cousin once removed to Charles III.