question: Who is Frederick Dickens's father?
context: [["Morris Harvey", ["Morris Harvey( 1877\u2013 1944) was a British actor and writer.", "A renowned character actor, he also wrote for the stage, including material for Broadway revues, in which he also appeared.", "He was the stepfather of film director Anthony Harvey."]], ["Charles Williams, Baron Williams of Elvel", ["Charles Cuthbert Powell Williams, Baron Williams of Elvel,( born 9 February 1933) is a retired business executive and a Labour peer.", "In his 20s he played first- class cricket while at university and for several seasons afterwards.", "He is the stepfather of Justin Welby, the Archbishop of Canterbury."]], ["Lolo Soetoro", ["Lolo Soetoro", "( EYD: Lolo Sutoro;; 2 January 1935 \u2013 2 March 1987), also known as Lolo Soetoro Mangunharjo or Mangundikardjo, of Indonesia was the stepfather of Barack Obama, the 44th President of the United States."]], ["Albert E. Austin", ["Albert Elmer Austin( November 15, 1877 \u2013 January 26, 1942) was a Republican member of the United States House of Representatives from 1939 to 1941 and member of the Connecticut House of Representatives from 1917 to 1919 and from 1921 to 1923.", "He was the stepfather of Clare Boothe Luce."]], ["Albert Visetti", ["Albert Anthony Visetti( 13 May 1846\u201310 July 1928) was a Dalmatian musician who moved to London where he was Professor of Singing at the Royal College of Music, becoming a Fellow in 1921.", "He was the stepfather of the novelist Radclyffe Hall."]], ["Gerald Rudolff Ford", ["Gerald Rudolff Ford( December 9, 1890 \u2013 January 26, 1962) was an American businessman, creator of Ford Industries, and Republican politician who was the stepfather of U.S. President Gerald Ford and for whom Ford legally changed his name."]], ["Jerrold Wexler", ["Jerrold Wexler( June 27, 1924 \u2013 November 10, 1992) was a noted American businessman and film producer.", "He was the brother of cinematographer Haskell Wexler and the stepfather of actress Daryl Hannah."]], ["Elizabeth Dickens", ["Elizabeth Culliford Dickens (n\u00e9e Barrow; 21 December 1789 \u2013 13 September 1863) was the wife of John Dickens and the mother of English novelist Charles Dickens.", "She was the source for Mrs. Nickleby in her son's novel \"Nicholas Nickleby\" and for Mrs Micawber in \"David Copperfield\"."]], ["H\u00e9ctor Barrantes", ["H\u00e9ctor Barrantes Sansoni( 1939\u20131990) was an Argentine polo player.", "He was the stepfather of Sarah, Duchess of York."]], ["Frederick Dickens", ["Frederick William Dickens (4 July 1820 \u2013 20 October 1868) was the son of John and Elizabeth Dickens and was Charles Dickens's younger brother, who lived with Charles when he moved on to Furnival's Inn in 1834.", "He was the inspiration for two different Freds in his brother's books: the jovial nephew of Ebenezer Scrooge in \"A Christmas Carol\" and the dissolute brother of Little Nell in \"The Old Curiosity Shop\"."]]]
supporting_facts: [["Frederick Dickens", 0], ["Elizabeth Dickens", 0]]
evidences: [["Frederick William Dickens", "mother", "Elizabeth Dickens"], ["Elizabeth Dickens", "spouse", "John Dickens"]]
answer: John Dickens