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Queen Elizabeth The Queen Mother (1900 - 2002) (right) in mourning with Queen Elizabeth II and Queen Mary (centre) at the funeral of King George VI. (Photo by Ron Case/Getty Images)

Queen Elizabeth The Queen Mother (1900 - 2002) (right) in mourning with Queen Elizabeth II and Queen Mary (centre) at the funeral of King George VI.    (Photo by Ron Case/Getty Images)

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3rd June 1953: Queen Elizabeth II (left) with Philip, Duke of Edinburgh, Princess Margaret Rose (1930 - 2002) and Queen Elizabeth The Queen Mother (right) wearing full Coronation regalia in the Throne Room of Buckingham palace after her Coronation ceremony. (Photo by Topical Press Agency/Getty Images)

3rd June 1953:  Queen Elizabeth II (left) with Philip, Duke of Edinburgh, Princess Margaret Rose (1930 - 2002) and Queen Elizabeth The Queen Mother (right) wearing full Coronation regalia in the Throne Room of Buckingham palace after her Coronation ceremony.  (Photo by Topical Press Agency/Getty Images)

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April 1954: Queen Elizabeth The Queen Mother (1900 - 2002) sitting on a sun lounger with Princess Anne and Prince Charles. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

April 1954:  Queen Elizabeth The Queen Mother (1900 - 2002) sitting on a sun lounger with Princess Anne and Prince Charles.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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Portrait of Britain's Queen Mother (Elizabeth Bowes-Lyon, also Queen Elizabeth The Queen Mother, 1900 - 2002) (left) and US First Lady Mamie Eisenhower (1915 - 1979) during a royal visit, Washington DC, November 6, 1954. (Photo by PhotoQuest/Getty Images)

Portrait of Britain's Queen Mother (Elizabeth Bowes-Lyon, also Queen Elizabeth The Queen Mother, 1900 - 2002) (left) and US First Lady Mamie Eisenhower (1915 - 1979) during a royal visit, Washington DC, November 6, 1954. (Photo by PhotoQuest/Getty Images)

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21st January 1956: Queen Elizabeth The Queen Mother (1900 - 2002) touching her horse, Devon Loch for good luck before it competes in the Mildmay Memorial Chase at Sandown Park races. (Photo by L. Blandford/Topical Press Agency/Getty Images)

21st January 1956:  Queen Elizabeth The Queen Mother (1900 - 2002) touching her horse, Devon Loch for good luck before it competes in the Mildmay Memorial Chase at Sandown Park races.  (Photo by L. Blandford/Topical Press Agency/Getty Images)