Question: Who is the father-in-law of Empress Xiaojingxian?

Knowledge 1: Empress Xiaojingxian
Empress Xiaojingxian (28 June 1681 – 29 October 1731), of the Manchu Plain Yellow Banner Ula Nara clan, personal name Duoqimuli, was a consort of the Yongzheng Emperor.She was three years his junior. [SEP] Knowledge 2: Yongzheng Emperor
The Yongzheng Emperor (13 December 1678 – 8 October 1735), born Yinzhen, was the fifth Emperor of the Qing dynasty, and the third Qing emperor to rule over China proper, reigned from 1722 to 1735.A hard-working ruler, the Yongzheng Emperor's main goal was to create an effective government at minimal expense.Like his father, the Kangxi Emperor, the Yongzheng Emperor used military force to preserve the dynasty's position.His reign was known for being despotic, efficient, and vigorous.Although Yongzheng's reign was much shorter than that of both his father (the Kangxi Emperor) and his son (the Qianlong Emperor), the Yongzheng era was a period of peace and prosperity.The Yongzheng Emperor cracked down on corruption and reformed the financial administration.His reign saw the formation of the Grand Council, an institution which had an enormous impact on the future of the Qing dynasty.
Knowledge 1: Empress Xiaojingxian
Empress Xiaojingxian (28 June 1681 – 29 October 1731), of the Manchu Plain Yellow Banner Ula Nara clan, personal name Duoqimuli, was a consort of the Yongzheng Emperor.She was three years his junior. [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: Yongzheng Emperor
The Yongzheng Emperor (13 December 1678 – 8 October 1735), born Yinzhen, was the fifth Emperor of the Qing dynasty, and the third Qing emperor to rule over China proper, reigned from 1722 to 1735.A hard-working ruler, the Yongzheng Emperor's main goal was to create an effective government at minimal expense.Like his father, the Kangxi Emperor, the Yongzheng Emperor used military force to preserve the dynasty's position.His reign was known for being despotic, efficient, and vigorous.Although Yongzheng's reign was much shorter than that of both his father (the Kangxi Emperor) and his son (the Qianlong Emperor), the Yongzheng era was a period of peace and prosperity.The Yongzheng Emperor cracked down on corruption and reformed the financial administration.His reign saw the formation of the Grand Council, an institution which had an enormous impact on the future of the Qing dynasty. [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: Kangxi