question: Who is Matilda Fitzroy, Duchess Of Brittany's father-in-law?
context: [["John Adams (merchant)", ["John Adams( 1672 or 1673 \u2013 1745) was an American- born Canadian merchant and member of the Nova Scotia Council.", "He was the father- in- law of Henry Newton( politician)."]], ["Ludwig von Westphalen", ["Johann Ludwig von Westphalen( 11 July 1770 \u2013 3 March 1842) was a liberal Prussian civil servant and the father- in- law of Karl Marx."]], ["Isabella FitzRoy, Duchess of Grafton", ["Isabella Bennet FitzRoy, Duchess of Grafton and later 2nd Countess of Arlington\" suo jure\"( c. 1668 \u2013 7 February 1723), was a British peer and heiress."]], ["Mary FitzRoy, Duchess of Richmond and Somerset", ["Mary FitzRoy, Duchess of Richmond and Somerset( Howard; 1519 \u2013 7 December 1557), born Lady Mary Howard, was the only daughter- in- law of King Henry VIII of England, being the wife of his only acknowledged illegitimate son, Henry FitzRoy, 1st Duke of Richmond and Somerset."]], ["Matilda FitzRoy, Duchess of Brittany", ["Maud or Matilda Fitzroy, was a duchess consort of Brittany by her marriage to Conan III, Duke of Brittany.", "She was an illegitimate daughter of Henry I of England by one of his unknown mistresses."]], ["Ogawa Mataji", ["Viscount was a general in the early Imperial Japanese Army.", "He was also the father- in- law of Field Marshal Gen Sugiyama."]], ["Marie of Blois, Duchess of Anjou", ["Marie of Blois( 1345- 1404) was a daughter of Joanna, Duchess of Brittany and Charles, Duke of Brittany.", "Through marriage to Louis I, Duke of Anjou, she became Duchess of Anjou, Countess of Maine, Duchess of Touraine, titular Queen of Naples and Jerusalem and Countess of Provence."]], ["Conan III, Duke of Brittany", ["Conan III, also known as Conan of Cornouaille and Conan the Fat (c. 1093\u20131096 \u2013 September 17, 1148) was duke of Brittany, from 1112 to his death.", "He was the son of Duke Alan IV and Ermengarde of Anjou.", "Conan III allied himself with Stephen of England in Stephen's war against the dispossessed Empress Matilda."]], ["Barthold A. Butensch\u00f8n Sr.", ["Hans Barthold Andresen Butensch\u00f8n( 27 December 1877 \u2013 28 November 1971) was a Norwegian businessperson.", "He was born in Kristiania as a son of Nils August Andresen Butensch\u00f8n and Hanna Butensch\u00f8n, and grandson of Nicolay Andresen.", "Together with Mabel Anette Plahte( 1877 \u2013 1973, a daughter of Frithjof M. Plahte) he had the son Hans Barthold Andresen Butensch\u00f8n Jr. and was through him the father- in- law of Ragnhild Butensch\u00f8n and grandfather of Peter Butensch\u00f8n.", "Through his daughter Marie Claudine he was the father- in- law of Joakim Lehmkuhl, through his daughter Mabel Anette he was the father- in- law of Harald Astrup( a son of Sigurd Astrup) and through his daughter Nini Augusta he was the father- in- law of Ernst Torp.", "He took commerce school and agricultural school.", "He was hired in the family company N. A. Andresen& Co, and became a co-owner in 1910.", "He eventually became chief executive officer.", "The bank changed its name to Andresens Bank in 1913 and merged with Bergens Kreditbank in 1920.", "The merger was dissolved later in the 1920s.", "He was also a landowner, owning Nedre Sk\u00f8yen farm and a lot of land in Enebakk.", "He chaired the board of Nydalens Compagnie from 1926, having not been a board member before that.", "He also chaired the supervisory council of Forsikringsselskapet Viking and Nedre Glommen salgsforening, and was a supervisory council member of Filharmonisk Selskap.", "He was a member of the gentlemen's club SK Fram since 1890, and was proclaimed a lifetime member in 1964.", "He was buried in Enebakk."]], ["Margaret of Huntingdon, Duchess of Brittany", ["Margaret of Huntingdon( 1145\u20131201) was a Scottish princess and Duchess of Brittany.", "She was the sister of Scottish kings Malcolm IV and William I, wife of Conan IV, Duke of Brittany, and the mother of Constance, Duchess of Brittany.", "Her second husband was Humphrey de Bohun, hereditary Constable of England.", "Following her second marriage, Margaret styled herself as the Countess of Hereford."]]]
supporting_facts: [["Matilda FitzRoy, Duchess of Brittany", 0], ["Conan III, Duke of Brittany", 1]]
evidences: [["Matilda FitzRoy, Duchess of Brittany", "spouse", "Conan III, Duke of Brittany"], ["Conan III, Duke of Brittany", "father", "Alan IV"]]
answer: Alan IV