Felix Brunner
Sir Felix John Morgan Brunner, 3rd Baronet( 13 October 1897 – 2 November 1982) was a British Liberal Party politician and business owner.
He was the maternal uncle of Katharine, Duchess of Kent.
Sarah Troughton
Sarah Rose Troughton CStJ( born 3 May 1953) is the Lord Lieutenant of Wiltshire, appointed with effect from February 2012.
She is the first woman to hold the position since it was created in the 16th century.
A cousin of Elizabeth II, for ten years she was lady- in- waiting to Katharine, Duchess of Kent.
Giles Worsley
Giles Arthington Worsley( 22 March 1961 – 17 January 2006) was an English architectural historian, author, editor, journalist and critic, specialising in British country houses.
He was the second son of Sir Marcus Worsley of Hovingham Hall, a nephew of Katharine, Duchess of Kent, and died of cancer aged 44.
Prince Edward, Duke of Kent
Prince Edward, Duke of Kent, (Edward George Nicholas Paul Patrick; born 9 October 1935) is a member of the British royal family.
He is a first cousin of Queen Elizabeth II through their fathers, Prince George, Duke of Kent, and King George VI.
Because his mother, Princess Marina of Greece and Denmark was a cousin of Prince Philip, Duke of Edinburgh, Edward is both a second cousin and first cousin once removed to Prince Charles and his siblings.
He has held the title of Duke of Kent since the age of six, after the death of his father in a plane crash in 1942.
He carries out engagements on behalf of the Queen.
He is president of the All England Lawn Tennis and Croquet Club, presenting the trophies to the Wimbledon champion and runner-up, and served as the United Kingdom's Special Representative for International Trade and Investment, retiring in 2001.
He is president of The Scout Association, the Royal United Services Institute, and the Royal Institution of Great Britain, and since 1967 Grand Master of the United Grand Lodge of England.
He is also patron of the Institute of Advanced Motorists, an independent road safety charity which specialises in training and advice for post-licence drivers and riders.
Lord Nicholas Windsor
Lord Nicholas Charles Edward Jonathan Windsor( born 25 July 1970) is a member of the British royal family, the youngest child of Prince Edward, Duke of Kent, and Katharine, Duchess of Kent, and a great- grandson of King George V.
He is a first cousin once removed of Queen Elizabeth II.
George Windsor, Earl of St Andrews
George Philip Nicholas Windsor, Earl of St Andrews( born 26 June 1962) is the elder son of Prince Edward, Duke of Kent, and his wife Katharine, Duchess of Kent.
He is styled Earl of St Andrews, one of his father's subsidiary titles, which he holds by courtesy as heir apparent to the Dukedom of Kent.
Katharine, Duchess of Kent
Katharine, Duchess of Kent, (born Katharine Lucy Mary Worsley; 22 February 1933)
is a member of the British royal family.
Her husband, Prince Edward, Duke of Kent, is a first cousin of Queen Elizabeth II.
The Duchess of Kent gained attention for her conversion to Catholicism in 1994; she was the first member of the royal family to convert publicly since the passing of the Act of Settlement 1701.
The Duchess of Kent is strongly associated with the world of music and has performed as a member of several choirs.
Barthold A. Butenschøn Sr.
Hans Barthold Andresen Butenschøn( 27 December 1877 – 28 November 1971) was a Norwegian businessperson.
He was born in Kristiania as a son of Nils August Andresen Butenschøn and Hanna Butenschøn, and grandson of Nicolay Andresen.
Together with Mabel Anette Plahte( 1877 – 1973, a daughter of Frithjof M. Plahte) he had the son Hans Barthold Andresen Butenschøn Jr. and was through him the father- in- law of Ragnhild Butenschøn and grandfather of Peter Butenschøn.
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 Skøyen 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.
Ogawa Mataji
Viscount was a general in the early Imperial Japanese Army.
He was also the father- in- law of Field Marshal Gen Sugiyama.
Lady Helen Taylor
Lady Helen Marina Lucy Taylor ("née" Windsor; born 28 April 1964) is a relative of the British royal family.
She is the daughter of Prince Edward, Duke of Kent, and Katharine, Duchess of Kent, and a great-granddaughter of King George V. She is currently 43rd in line of succession to the British throne.

Question: Who is Katharine, Duchess Of Kent's father-in-law?
Answer: Prince George, Duke of Kent