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circa 1925: From the left: King George V and Queen Mary (seated), the Duke of York and Duchess of York with 14 month old Princess Elizabeth and, on the extreme right, the Earl and Countess of Strathmore. (Photo by Hulton Archive/Getty Images)

circa 1925:  From the left: King George V and Queen Mary (seated), the Duke of York and Duchess of York with 14 month old Princess Elizabeth and, on the extreme right, the Earl and Countess of Strathmore.  (Photo by Hulton Archive/Getty Images)

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Princesses Elizabeth and Margaret Rose, 1932, (1937). The future Queen Elizabeth II (1926-), seen here aged six, with her younger sister Princess Margaret (1930-2002), aged two. A photograph from the Illustrated London News: Coronation Record Number, (London, 1937). (Photo by The Print Collector/Print Collector/Getty Images)

Princesses Elizabeth and Margaret Rose, 1932, (1937). The future Queen Elizabeth II (1926-), seen here aged six, with her younger sister Princess Margaret (1930-2002), aged two. A photograph from the Illustrated London News: Coronation Record Number, (London, 1937). (Photo by The Print Collector/Print Collector/Getty Images)

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British Royalty, Pic: circa 1933, Their Royal Highnesses The Duke and Duchess of York with their children Princess Elizabeth (later Queen Elizabeth II) and Princess Margaret. (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

British Royalty, Pic: circa 1933, Their Royal Highnesses The Duke and Duchess of York with their children Princess Elizabeth (later Queen Elizabeth II) and Princess Margaret.  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

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The Queen Mother as Duchess of York, with Princess Margaret and Princess Elizabeth at the Royal Lodge in Windsor in England, circa June 1936. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

The Queen Mother as Duchess of York, with Princess Margaret and Princess Elizabeth at the Royal Lodge in Windsor  in England, circa June 1936.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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July 1936: The Duke of York with Elizabeth and Princess Elizabeth standing with a corgi on the steps of 145 Piccadilly, London. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

July 1936:  The Duke of York with Elizabeth and Princess Elizabeth standing with a corgi on the steps of 145 Piccadilly, London.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)