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La Princesse Margaret et son fiancé Tony Armstrong-Jones en compagnie de la Reine Mère Elizabeth dans le jardin du château le 27 février 1960 à Windsor, Royaume-Uni. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

La Princesse Margaret et son fiancé Tony Armstrong-Jones en compagnie de la Reine Mère Elizabeth dans le jardin du château le 27 février 1960 à Windsor, Royaume-Uni. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

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5th August 1960: Princess Anne playing with her baby brother Prince Andrew who is sitting on the lap of the Queen Mother (1900 - 2002) during her 60th birthday celebrations in the gardens of Clarence House. (Photo by Keystone/Getty Images)

5th August 1960:  Princess Anne playing with her baby brother Prince Andrew who is sitting on the lap of the Queen Mother (1900 - 2002) during her 60th birthday celebrations in the gardens of Clarence House.  (Photo by Keystone/Getty Images)

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Queen Elizabeth The Queen Mother (1900-2002) pictured with her daughter Princess Margaret (1930-2002) travelling in a car to an engagement circa 1965. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

Queen Elizabeth The Queen Mother (1900-2002) pictured with her daughter Princess Margaret (1930-2002) travelling in a car to an engagement circa 1965. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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EPSOM;UNITED KINGDOM - UNDATED: Queen Elizabeth ll and the Queen Mother with Sir Angus Ogilvy watch the race while at the Epsom Derby,Epsom,Surrey in the 1970s.(Photo by Anwar Hussein/Getty Images)

EPSOM;UNITED KINGDOM - UNDATED: Queen Elizabeth ll and the Queen Mother with Sir Angus Ogilvy watch the race while at the Epsom Derby,Epsom,Surrey in the 1970s.(Photo by Anwar Hussein/Getty Images)

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15th July 1980: Members of the royal family at Buckingham Palace, Viscount Lindley, Prince Andrew, Prince Charles, Prince Edward, Lady Sarah Armstrong Jones, Queen Elizabeth the Queen Mother (1900 - 2002) and Princess Anne. Official 80th birthday portraits of the Queen Mother. (Photo by Fox Photos/Getty Images)

15th July 1980:  Members of the royal family at Buckingham Palace, Viscount Lindley, Prince Andrew, Prince Charles, Prince Edward, Lady Sarah Armstrong Jones, Queen Elizabeth the Queen Mother (1900 - 2002) and Princess Anne. Official 80th birthday portraits of the Queen Mother.  (Photo by Fox Photos/Getty Images)