Ronald Armstrong-Jones
Major Ronald Owen Lloyd Armstrong- Jones,(" né" Jones; 18 May 1899 – 27 January 1966) was a Welsh barrister and soldier.
He was the father of Antony Armstrong- Jones, 1st Earl of Snowdon, and father- in- law of Princess Margaret, younger daughter of George VI.
Prince Max, Duke in Bavaria
Max-Emanuel Ludwig Maria Herzog in Bayern (sometimes styled Prince Max of Bavaria, Duke in Bavaria; born 21 January 1937) as the younger son of Albrecht, Duke of Bavaria, is the heir presumptive to both the headship of the former Bavarian royal house and the Jacobite succession.
He was born a Prince of Bavaria, as a member of the royal line of the House of Wittelsbach, but has been using the title "Herzog in Bayern" or Duke in Bavaria, since he was adopted as an adult by his great-uncle, Duke Ludwig Wilhelm in Bavaria, the last bearer of that title of a junior branch of the House of Wittelsbach, from whom he inherited considerable estates at Tegernsee Abbey (including a brewery), Banz Abbey and Kreuth.
Duchess Mathilde Ludovika in Bavaria
Mathilde Ludovika, Duchess in Bavaria( 30 September 1843 – 18 June 1925) was the fourth daughter of Maximilian, Duke in Bavaria and Princess Ludovika of Bavaria.
Her mother was the youngest daughter of King Maximilian I Joseph of Bavaria by his second wife Margravine Karoline of Baden.
Peter Burroughs
Peter Burroughs( born 27 January 1947) is a British television and film actor, the director of Willow Management.
He is the father- in- law of actor and TV presenter Warwick Davis.
John Adams (merchant)
John Adams( 1672 or 1673 – 1745) was an American- born Canadian merchant and member of the Nova Scotia Council.
He was the father- in- law of Henry Newton( politician).
Princess Elisabeth, Duchess of Brabant
Princess Elisabeth, Duchess of Brabant( born 25 October 2001), is the heir apparent to the Belgian throne.
The eldest child of King Philippe and Queen Mathilde, she acquired her position after her grandfather King Albert II abdicated in favour of her father on 21 July 2013.
Ogawa Mataji
Viscount was a general in the early Imperial Japanese Army.
He was also the father- in- law of Field Marshal Gen Sugiyama.
Ludwig von Westphalen
Johann Ludwig von Westphalen( 11 July 1770 – 3 March 1842) was a liberal Prussian civil servant and the father- in- law of Karl Marx.
Princess Elisabeth, Duchess in Bavaria
Princess Elisabeth, Duchess in Bavaria (born 31 December 1940) is the wife of Prince Max, Duke in Bavaria, heir presumptive to both the former Bavarian Royal House and the Jacobite Succession.
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.

Question: Who is Princess Elisabeth, Duchess In Bavaria's father-in-law?
Answer: Albrecht, Duke of Bavaria