Question: Who is the father-in-law of Countess Alexandra Von Zarnekau?

Knowledge 1: Countess Alexandra von Zarnekau
Countess Alexandra Constantinovna von Zarnekau (Russian: графиня Александра Константиновна Зарнекау, 10 May 1883 - 28 May 1957) was the eldest daughter of Duke Constantine Petrovich of Oldenburg and his morganatic wife, Agrippina Japaridze, Countess von Zarnekau.At age 17, on 11 February 1900, Countess Alexandra married Prince George Alexandrovich Yuryevsky, the son of Tsar Alexander II by his mistress (and later wife), Ekaterina Mikhailovna Dolgorukova, the Princess Yourievskya.They were married at Nice, France, and had one child, Prince Alexander Georgievich Yourievsky, who was born 20 December 1901.Alexandra and George divorced in 1908.Countess Alexandra married secondly to Leo Vassilievich Narishkin on 17 October 1908 at Paris, France.During the First World War, Countess Alexandra worked as an administrator of the Russian hospital at Saloniki.After the war, she settled in Paris, France.She died there on 28 May 1957 at age 74. [SEP] Knowledge 2: Prince George Alexandrovich Yuryevsky
Prince George Alexandrovich Yuryevsky (12 May 1872 [30 April 1872 O. S.] – 13 September 1913) was the natural son of Alexander II of Russia by his mistress (and later wife), Catherine Dolgorukov.The morganatic marriage of George's parents on 6 July 1880, eight years after his birth, resulted in the legitimation of their three surviving children, and George gained the style of "Serene Highness".
Knowledge 1: Countess Alexandra von Zarnekau
Countess Alexandra Constantinovna von Zarnekau (Russian: графиня Александра Константиновна Зарнекау, 10 May 1883 - 28 May 1957) was the eldest daughter of Duke Constantine Petrovich of Oldenburg and his morganatic wife, Agrippina Japaridze, Countess von Zarnekau.At age 17, on 11 February 1900, Countess Alexandra married Prince George Alexandrovich Yuryevsky, the son of Tsar Alexander II by his mistress (and later wife), Ekaterina Mikhailovna Dolgorukova, the Princess Yourievskya.They were married at Nice, France, and had one child, Prince Alexander Georgievich Yourievsky, who was born 20 December 1901.Alexandra and George divorced in 1908.Countess Alexandra married secondly to Leo Vassilievich Narishkin on 17 October 1908 at Paris, France.During the First World War, Countess Alexandra worked as an administrator of the Russian hospital at Saloniki.After the war, she settled in Paris, France.She died there on 28 May 1957 at age 74. [SEP] Knowledge 2: 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.
Knowledge 1: Prince George Alexandrovich Yuryevsky
Prince George Alexandrovich Yuryevsky (12 May 1872 [30 April 1872 O. S.] – 13 September 1913) was the natural son of Alexander II of Russia by his mistress (and later wife), Catherine Dolgorukov.The morganatic marriage of George's parents on 6 July 1880, eight years after his birth, resulted in the legitimation of their three surviving children, and George gained the style of "Serene Highness". [SEP] Knowledge 2: 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.

Answer: Alexander II of Russia