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Princess Marina, Duchess of Kent (1906 - 1968) holds the hand of her son Prince Edward as they leave her house in Belgrave Square, London. A nanny carries Princess Alexandra, the Duchess's daughter. Princess Marina is wearing a spotted dress, cardigan, two coloured peep-toed shoes, gauntlet gloves and carries a small clutch bag. (Photo by Topical Press Agency/Getty Images)

Princess Marina, Duchess of Kent (1906 - 1968) holds the hand of her son Prince Edward as they leave her house in Belgrave Square, London. A nanny carries Princess Alexandra, the Duchess's daughter. Princess Marina is wearing a spotted dress, cardigan, two coloured peep-toed shoes, gauntlet gloves and carries a small clutch bag.   (Photo by Topical Press Agency/Getty Images)

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19th January 1937, London, England, A Nanny holds Princess Alexandra, the newly born daughter of the Duke and Duchess of Kent in London+s Belgrave Square (Photo by Popperfoto via Getty Images/Getty Images)

19th January 1937, London, England, A Nanny holds Princess Alexandra, the newly born daughter of the Duke and Duchess of Kent in London+s Belgrave Square  (Photo by Popperfoto via Getty Images/Getty Images)

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November 1937: The Duchess Marina of Kent (1906 - 1968), sitting on a rug on the lawn with her two children, Prince Edward and Princess Alexandra at 'Coppins' in Iver, Buckinghamshire. (Photo by Hulton Archive/Getty Images)

November 1937:  The Duchess Marina of Kent (1906 - 1968), sitting on a rug on the lawn with her two children, Prince Edward and Princess Alexandra at 'Coppins' in Iver, Buckinghamshire.  (Photo by Hulton Archive/Getty Images)

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circa 1938: The Duke and Duchess of Kent pose in the garden of the Buckinghamshire home, with Prince Edward, Princess Alexandra and their dog Muff. (Photo by PNA Rota/Getty Images)

circa 1938:  The Duke and Duchess of Kent pose in the garden of the Buckinghamshire home, with Prince Edward, Princess Alexandra and their dog Muff.  (Photo by PNA Rota/Getty Images)

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The Duke of Kent, George Edward Alexander Edmund, with the Duchess and their children (later the Duke and Princess Alexandra) at the christening of their third baby (Prince Michael). Original Publication: People Disc - HF0600 (Photo by Topical Press Agency/Getty Images)

The Duke of Kent, George Edward Alexander Edmund, with the Duchess and their children (later the Duke and Princess Alexandra) at the christening of their third baby (Prince Michael).  Original Publication: People Disc - HF0600   (Photo by Topical Press Agency/Getty Images)