question: Who is the paternal grandfather of Pierce Somerset Butler?
context: [["John Mackay (poet)", ["John Mackay( 1656\u20131754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross."]], ["Zhao Shoushan", ["Zhao Shoushan( 12 November 1894 \u2013 20 June 1965) was a KMT general and later Chinese Communist Party politician.", "He is the grandfather of Zhao Leji."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["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"]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Pierce Somerset Butler", ["Pierce Somerset Butler (26 January 1801 \u2013 28 July 1865) was an Irish politician in the United Kingdom House of Commons.", "He was the son of Hon.", "Pierce Butler and Anne March.", "He married Jessy Anne Bryan on 3 February 1835 in London at St George's, Hanover Square.", "They had two daughters.", "He attended Trinity College Dublin.", "Later he was elected to the United Kingdom House of Commons as Member of Parliament for County Kilkenny in 1843, and held the seat until 1852.", "For the first three years he served in this position with his father.", "Like his father he was not in favour of the Act of Union and discussed the repeal of this Act.", "Butler was also Chairman of the Waterford and Kilkenny Railway Company.", "In 1854 he was involved in the Case of Pierce Somerset Butler v Viscount Mountgarret.", "\"Verdict for plaintiff who thus came into a peerage, defendant being proved illegitimate\""]], ["Pierce Butler (1774\u20131846)", ["Pierce Butler (6 May 1774 \u2013 18 August 1846) was an Irish politician in the United Kingdom House of Commons.", "Butler was the son of Edmund Butler, 11th Viscount Mountgarret and Lady Henrietta Butler.", "He married Anne March, daughter of Thomas March, in 1800.", "They had eleven children including:", "He was elected to the United Kingdom House of Commons as Member of Parliament for County Kilkenny in 1832, and held the seat until 1846.", "In the House he spoke against Tithe enforcement and against the continuation of the Act of Union.", "He served as M.P. with his son.", "Butler gained the rank of Colonel in the service of the Kilkenny Militia.", "He died on 13 June 1846 at age 72."]], ["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."]], ["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: [["Pierce Somerset Butler", 2], ["Pierce Butler (1774\u20131846)", 1]]
evidences: [["Pierce Somerset Butler", "father", "Pierce Butler"], ["Pierce Butler", "father", "Edmund Butler, 11th Viscount Mountgarret"]]
answer: Edmund Butler, 11th Viscount Mountgarret