Question: Who is Empress Zhen (Liao Dynasty)'s father-in-law?

Knowledge 1: Empress Zhen (Liao dynasty)
Empress Zhen (甄皇后) (d. October 7, 951?) was an empress of the Khitan Liao dynasty.She was one of the two empresses of Emperor Shizong (Yelü Ruan). [SEP] Knowledge 2: Emperor Shizong of Liao
Emperor Shizong of Liao (29 January 919 – 7 October 951), personal name Wuyu, sinicised name Yelü Ruan, was the third emperor of the Khitan-led Liao dynasty.He was the son of Yelü Bei, the eldest son of Abaoji (Emperor Taizu), the founder of the Liao dynasty.He came to power in 947 after the death of his uncle, Emperor Taizong, who raised him in his father's absence.
Knowledge 1: Empress Zhen (Liao dynasty)
Empress Zhen (甄皇后) (d. October 7, 951?) was an empress of the Khitan Liao dynasty.She was one of the two empresses of Emperor Shizong (Yelü Ruan). [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: Emperor Shizong of Liao
Emperor Shizong of Liao (29 January 919 – 7 October 951), personal name Wuyu, sinicised name Yelü Ruan, was the third emperor of the Khitan-led Liao dynasty.He was the son of Yelü Bei, the eldest son of Abaoji (Emperor Taizu), the founder of the Liao dynasty.He came to power in 947 after the death of his uncle, Emperor Taizong, who raised him in his father's absence. [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: Yelü Bei