Lady Sarah Frances Elizabeth Chatto (née Armstrong-Jones; born 1 May 1964) is the only daughter of Princess Margaret, Countess of Snowdon, and the 1st Earl of Snowdon.
 She is a niece of Queen Elizabeth II and the youngest grandchild of King George VI and Queen Elizabeth The Queen Mother.
The Golden Jubilee of Queen Elizabeth II was the international celebration held in 2002 marking the 50th anniversary of the accession of Elizabeth II to the thrones of seven countries, upon the death of her father, King George VI, on 6 February 1952, and was intended by the Queen to be both a commemoration of her 50 years as monarch and an opportunity for her to officially and personally thank her people for their loyalty.
 Despite the deaths of her sister, Princess Margaret, and mother, Queen Elizabeth The Queen Mother, in February and March 2002 respectively, and predictions in the media that the anniversary would be a non-event, the jubilee was marked with large-scale and popular events throughout London in June of the same year, bookended by events throughout the Commonwealth realms. Elizabeth attended all of the official celebrations as scheduled, along with her husband, the Duke of Edinburgh; over twelve months, the royal couple journeyed more than 40000 mi to the Caribbean, Australia, New Zealand, then around the United Kingdom, and wrapped up the jubilee year in Canada.
 Numerous landmarks, parks, buildings, and the like, were also named in honour of the golden jubilee and commemorative medals, stamps, and other symbols were issued.
Elizabeth Angela Marguerite Bowes-Lyon (4 August 1900 – 30 March 2002) was the wife of King George VI and the mother of Queen Elizabeth II and Princess Margaret, Countess of Snowdon.
 She was Queen of the United Kingdom and the Dominions from her husband's accession in 1936 until his death in 1952, after which she was known as Queen Elizabeth The Queen Mother, to avoid confusion with her daughter.
 She was the last Empress of India.
David Albert Charles Armstrong-Jones, 2nd Earl of Snowdon (born 3 November 1961), styled as Viscount Linley until 2017 and known professionally as David Linley, is an English furniture maker and the former chairman of the auction house Christie's UK.
 The son of Princess Margaret, Countess of Snowdon, and of Antony Armstrong-Jones, 1st Earl of Snowdon, he is a grandson of King George VI and is 18th in line of succession to the British throne, the first in line who is not a descendant of Queen Elizabeth II.
Elizabeth at 90: A Family Portrait is a 2016 television documentary film made to commemorate the 90th birthday of Queen Elizabeth II.
 It was produced by the BBC and directed by John Bridcut, and narrated by Charles, Prince of Wales.
 Aside from archive footage, the programme featured extensive footage shot by the Queen, Prince Philip, Duke of Edinburgh, Princess Margaret, King George VI and Queen Elizabeth the Queen Mother.
 The footage had never been publicly shown and came from the Queen's private archive of homemade films.
 The footage shown was interspersed with members of the British royal family commenting on the films.
 The film featured contributions from the Queen, the Prince of Wales, Anne, Princess Royal, Prince William, Duke of Cambridge and Prince Harry, Lady Sarah Chatto, Prince Edward, Duke of Kent and Princess Alexandra, The Honourable Lady Ogilvy.
Anne Caroline Salisbury (1805 – 3 May 1881) was the wife of Edwyn Burnaby, and mother of Edwyn Sherard Burnaby and Caroline Louisa Burnaby.
 She is the maternal great-grandmother of Queen Elizabeth The Queen Mother and great-great-grandmother of Queen Elizabeth II.
Antony Charles Robert Armstrong-Jones, 1st Earl of Snowdon, (7 March 1930 – 13 January 2017), commonly known as Lord Snowdon, was a British photographer and film maker.
 He was married to Princess Margaret, younger daughter of King George VI and the sister of Queen Elizabeth II.
Princess Margaret, Countess of Snowdon, {'1': ", '2': ", '3': ", '4': "} (Margaret Rose; 21 August 1930 – 9 February 2002) was the younger daughter of King George VI and Queen Elizabeth of the United Kingdom and the only sibling of Queen Elizabeth II.
The Princess Margaret Bridge, sometimes called the Princess Margaret Rose Bridge or shortened to just PMB, is a two-lane highway bridge crossing the Saint John River at Fredericton, New Brunswick, Canada.
 It is named after HM Queen Elizabeth II's sister HRH The Princess Margaret, Countess of Snowdon.
The George VI and Queen Elizabeth Memorial, situated between The Mall and Carlton Gardens in central London, is a memorial to King George VI and his consort, Queen Elizabeth The Queen Mother.
 Completed in its present form in 2009, the memorial incorporates an earlier, Grade II-listed statue of George VI by William McMillan, unveiled by his daughter Queen Elizabeth II in 1955.
 The reconfigured memorial, which includes a statue of the Queen Mother by Philip Jackson, relief sculpture by Paul Day and an architectural setting by Donald Buttress and Donald Insall, was unveiled by Elizabeth II in 2009.

Question: Anne Caroline Salisbury is the maternal great-grandmother of which wife of King George VI and the mother of Queen Elizabeth II and Princess Margaret, Countess of Snowdon?
Answer: Queen Elizabeth The Queen Mother