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H.R.H. Princess Elizabeth and Prince Charles', 1948. The future Queen Elizabeth II and her firstborn, Charles Prince of Wales. [Raphael Tuck & Sons Ltd., London, 1948]. Artist Stirling Henry Nahum. (Photo by The Print Collector/Getty Images)

H.R.H. Princess Elizabeth and Prince Charles', 1948. The future Queen Elizabeth II and her firstborn, Charles Prince of Wales. [Raphael Tuck & Sons Ltd., London, 1948]. Artist Stirling Henry Nahum. (Photo by The Print Collector/Getty Images)

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Queen Elizabeth II with, on left, Princess Anne of Edinburgh and Prince Charles, by society photographer Marcus Adams, London, 1954. Prince Charles is six years old and Princess Anne is four. (Photo by Marcus Adams/Paul Popper/Popperfoto via Getty Images)

Queen Elizabeth II with, on left, Princess Anne of Edinburgh and Prince Charles, by society photographer Marcus Adams, London, 1954. Prince Charles is six years old and Princess Anne is four. (Photo by Marcus Adams/Paul Popper/Popperfoto via Getty Images)

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14th November 1952: Queen Elizabeth II with Prince Charles and Princess Anne in the grounds of Balmoral Castle, Scotland. Charles is celebrating his 4th birthday. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

14th November 1952:  Queen Elizabeth II with Prince Charles and Princess Anne in the grounds of Balmoral Castle, Scotland. Charles is celebrating his 4th birthday.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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28th September 1952: Queen Elizabeth with her husband Prince Philip, Duke of Edinburgh and her children, Charles and Anne at Balmoral Castle in Scotland. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

28th September 1952:  Queen Elizabeth with her husband Prince Philip, Duke of Edinburgh and her children, Charles and Anne at Balmoral Castle in Scotland.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)