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9th October 1943: His Royal Highness Prince Edward (1935 - ) the eldest child of the Duchess of Kent with his sister Princess Alexandra (1936 - ) on their bikes in the garden of 'Coppins', their home in Buckinghamshire on the occasion of his eigth birthday. (Photo by Hulton Archive/Getty Images)

9th October 1943:  His Royal Highness Prince Edward (1935 - )  the eldest child of the Duchess of Kent with his sister Princess Alexandra (1936 - ) on their bikes in the garden of 'Coppins', their home in Buckinghamshire on the occasion of his eigth birthday.  (Photo by Hulton Archive/Getty Images)

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1946: From left to right, Pamela Mountbatten, Princess Alexandra of Kent, Princess Margaret (1930 - 2002) and Princess Elizabeth stand outside Romsey Abbey, Hampshire in their bridesmaids' dresses after attending the wedding of Captain Lord Brabourne and Patricia Mountbatten. (Photo by PNA Rota/Getty Images)

1946:  From left to right, Pamela Mountbatten, Princess Alexandra of Kent, Princess Margaret (1930 - 2002) and Princess Elizabeth stand outside Romsey Abbey, Hampshire in their bridesmaids' dresses after attending the wedding of Captain Lord Brabourne and Patricia Mountbatten.  (Photo by PNA Rota/Getty Images)

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Princess Marina, Duchess of Kent (1906 - 1968), accompanied by her daughter, Princess Alexandra, The Honourable Lady Ogilvy, lays the foundation stone of the Sixth Clothworkers' Hall in Mincing Lane, London, 17th July 1956. The Fifth Hall, situated on the same site, was destroyed by a fire caused by a World War II air raid. (Photo by Central Press/Hulton Archive/Getty Images)

Princess Marina, Duchess of Kent (1906 - 1968), accompanied by her daughter, Princess Alexandra, The Honourable Lady Ogilvy, lays the foundation stone of the Sixth Clothworkers' Hall in Mincing Lane, London, 17th July 1956. The Fifth Hall, situated on the same site, was destroyed by a fire caused by a World War II air raid. (Photo by Central Press/Hulton Archive/Getty Images)

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4th October 1956: Princess Alexandra enjoys a talk with the Duke and Duchess of Kent. (Photo by Dennis Oulds/Central Press/Getty Images)

4th October 1956:  Princess Alexandra enjoys a talk with the Duke and Duchess of Kent.  (Photo by Dennis Oulds/Central Press/Getty Images)

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circa 1960: Princess Alexandra, the Duchess of Kent (1936 - ) holding a bouquet. (Photo by Hulton Archive/Getty Images)

circa 1960:  Princess Alexandra, the Duchess of Kent (1936 - ) holding a bouquet.  (Photo by Hulton Archive/Getty Images)