question: Who is Geoffrey Russell, 4Th Baron Ampthill's paternal grandfather?
context: [["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."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Henry Wentworth", ["Sir Henry Wentworth of Nettlestead, Suffolk, KB( born c. 1448 \u2013 died between 17 August 1499 and 27 February 1501),\" de jure\" 4th Baron le Despencer, was the grandfather of Henry VIII's third wife, Jane Seymour, and the great- grandfather of Jane's son, Edward VI."]], ["Geoffrey Russell, 4th Baron Ampthill", ["Geoffrey Denis Erskine Russell, 4th Baron Ampthill, (15 October 1921 \u2013 23 April 2011) was a British hereditary peer and businessman, whose paternity and succession to the peerage were famously disputed in the \"Ampthill baby case\".", "His father, John Russell, 3rd Baron Ampthill had petitioned to disclaim paternity whilst divorcing Russell's mother, Christabel Hulme Hart, in 1923, claiming non-consummation.", "The petition was rejected on appeal and Russell's mother was granted a declaration that he was legitimate.", "Educated at Stowe School, Russell served in the Irish Guards during the Second World War, being commissioned as a Captain in 1941.", "He served with the Guards Armoured Division in France in 1944, where he was wounded, and in Norway in 1945.", "Russell was general manager of Fortnum & Mason from 1947 until resigning in 1951, then chairman of the New Providence Hotel until 1965.", "He made a career in theatrical management as owner/managing director of Linnet & Dunfee (which produced the original production of the musical hit \"Salad Days\") from 1953 until 1981.", "He was afterwards a director of United Newspapers and Express Newspapers.", "He was also Chairman of London's Helicopter Emergency Service.", "Russell succeeded as Baron Ampthill in 1973, upon the death of his father.", "His succession was unsuccessfully contested by his half-brother the Hon.", "John Hugo Trenchard Russell, eldest son of the 3rd Baron's third marriage.", "Committee for Privileges ruled in favour of Geoffrey in 1976.", "In the House of Lords, Ampthill sat as a crossbencher.", "He was a deputy speaker from 1983 and Chairman of Committees from 1992 to 1994.", "He was appointed a CBE in 1986\u2014following in the footsteps of his father who was also appointed a CBE\u2014and made a Privy Counsellor in 1995.", "Following the passage of the House of Lords Act 1999 which removed the majority of hereditary peers from the House, Ampthill was one of the ninety hereditaries elected to continue to sit.", "He was one of fifteen peers elected by the whole house to be available to serve as deputy speakers and office holders.", "In 1946, Ampthill married Susan Winn, a granddaughter of the 2nd Baron St Oswald and the 1st Baron Queenborough, whom he divorced in 1971; they had three sons and a daughter.", "He then married Elisabeth Mallon in 1972, divorcing her in 1987.", "He was succeeded in the title by his first-born son David Russell."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Prithvipati Shah", ["Prithvipati Shah( ?\u20131716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.", "He was the grandfather of Nara Bhupal Shah."]], ["G. R. Searle", ["Geoffrey Russell Searle, born 1941, is a British historian, specialising in British nineteenth century history.", "He is Emeritus Professor at the University of East Anglia."]], ["John Russell, 3rd Baron Ampthill", ["Captain John Hugo Russell, 3rd Baron Ampthill, CBE (4 October 1896 \u2013 3 June 1973) was a British peer who served in the Royal Navy in both the First and Second World Wars.", "He was the son of Oliver Russell, 2nd Baron Ampthill.", "He succeeded to the title of Baron Ampthill, of Ampthill in the County of Bedford on 7 July 1935."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["David Russell, 5th Baron Ampthill", ["David Whitney Erskine Russell, 5th Baron Ampthill( born 27 May 1947) is the son of Geoffrey Russell, 4th Baron Ampthill, and was educated at Stowe School.", "He served as a councillor on Rye Town Council from July 2003 until April 2013, and currently serves as a Conservative councillor on Rother District Council.", "He previously served on East Grinstead Town Council and held the post of Mid Sussex District Council Cabinet Member for Community Development.", "Before entering politics Russell enjoyed a career in publishing.", "With his first wife April McKenzie Arbon he has two daughters.", "He is currently married to Christia Ipsen, the widow of Prince Rostislav Rostislavovich of Russia.", "He succeeded his father as Baron Ampthill in April 2011; the title had been created for his great- great- grandfather, Lord Odo Russell, who represented Britain unofficially at the Vatican and officially at Berlin; Lord Odo's uncle was Lord John Russell, who was twice Prime Minister and whose grandson was Bertrand Russell, the eminent 20th century philosopher."]]]
supporting_facts: [["Geoffrey Russell, 4th Baron Ampthill", 1], ["John Russell, 3rd Baron Ampthill", 1]]
evidences: [["Geoffrey Denis Erskine Russell, 4th Baron Ampthill", "father", "John Russell, 3rd Baron Ampthill"], ["John Russell, 3rd Baron Ampthill", "father", "Oliver Russell"]]
answer: Oliver Russell