question: Who is Kathleen Cavendish, Marchioness Of Hartington's maternal grandfather?
context: [["Margaret, Marchioness of Namur", ["Margaret, Marchioness of Namur( c. 1194 \u2013 17 July 1270) was ruling Marchioness of Namur in 1229- 1237.", "She was the daughter of Peter II of Courtenay and Yolanda of Flanders."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Charlotte Cavendish, Marchioness of Hartington", ["Charlotte Elizabeth Cavendish, Marchioness of Hartington, 6th Baroness Clifford (\"n\u00e9e\" Boyle; 27 October 1731 \u2013 8 December 1754) was the daughter of Richard Boyle, 3rd Earl of Burlington and Lady Dorothy Savile.", "From 1748 until her death she was married to William Cavendish, Marquess of Hartington, later the 4th Duke of Devonshire and Prime Minister of Great Britain."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Kathleen Cavendish, Marchioness of Hartington", ["Kathleen Agnes Cavendish, Marchioness of Hartington (\"n\u00e9e\" Kennedy; February 20, 1920 \u2013 May 13, 1948), also known as \"Kick\" Kennedy, was an American socialite.", "She was the daughter of Joseph P. Kennedy, Sr.", "and Rose Kennedy, sister of future U.S. President John F. Kennedy, and wife of the Marquess of Hartington, heir apparent to the 10th Duke of Devonshire.", "When her father was serving as United States Ambassador to the United Kingdom, Kathleen made many friends in London and was the \"debutante of 1938.", "\" Working with the Red Cross, she began a romantic relationship with Lord Hartington, whom she married in May 1944.", "He was killed on active service in Belgium only four months later.", "Kick died in a plane crash in 1948, flying to the south of France while on vacation with her new partner, the 8th Earl Fitzwilliam."]], ["Rose Kennedy", ["Rose Elizabeth Fitzgerald Kennedy, Countess of the Holy Roman Church", "(July 22, 1890 \u2013 January 22, 1995) was an American philanthropist, socialite, and the matriarch of the Kennedy family.", "She was deeply embedded in the \"lace curtain\" Irish Catholic community in Boston, where her father John F. Fitzgerald was mayor.", "Kennedy was the wife of businessman and investor Joseph P. Kennedy Sr., who was United States Ambassador to the United Kingdom, formally known as Ambassador to the Court of St. James's in the UK.", "Their nine children included President John F. Kennedy, Senator Robert F. Kennedy, and longtime Senator Ted Kennedy.", "In 1951 she was ennobled by Pope Pius XII, becoming the sixth American woman to be granted the rank of Papal countess."]], ["Henry Krause", ["Henry J.\" Red\" Krause, Jr.( August 28, 1913 \u2013 February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.", "He played college football at St. Louis University.", "He is the grandfather of Jennifer Krause", "He is the great grandfather of Payton Hoeing"]], ["Fred Le Deux", ["Frederick\" Fred\" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).", "He is the grandfather of Tom Hawkins."]]]
supporting_facts: [["Kathleen Cavendish, Marchioness of Hartington", 2], ["Rose Kennedy", 2]]
evidences: [["Kathleen Agnes Cavendish, Marchioness of Hartington", "mother", "Rose Kennedy"], ["Rose Kennedy", "father", "John F. Fitzgerald"]]
answer: John F. Fitzgerald