Question: Who is the father-in-law of Mary Dudley?

Knowledge 1: Mary Dudley
Mary Sidney (née Dudley) (c. 1530–1535 – 9 August 1586) was a lady-in-waiting at the court of Elizabeth I, and the mother of Sir Philip Sidney and Mary Sidney Herbert, Countess of Pembroke.A daughter of John Dudley, Duke of Northumberland, she was marginally implicated in her father's attempt to place Lady Jane Grey on the English throne and affected by his attainder.Mary Dudley was one of Queen Elizabeth's most intimate confidantes during the early years of her reign.Her duties included nursing the Queen through smallpox in 1563 and acting as her mouthpiece towards diplomats.A sister of Elizabeth's favourite, Robert Dudley, Earl of Leicester, she remained always loyal to her family.She was the mother of seven children and accompanied her husband, Sir Henry Sidney, to Ireland and the Welsh Marches.From the 1570s the couple complained repeatedly about their, as they saw it, poor treatment at the Queen's hands.Still one of Elizabeth's favourite ladies, Mary Dudley retired from court life in 1579, suffering from ill health during her last years. [SEP] Knowledge 2: Henry Sidney
Sir Henry Sidney (1529 – 5 May 1586), Lord Deputy of Ireland, was the eldest son of Sir William Sidney of Penshurst, a prominent politician and courtier during the reigns of Henry VIII and Edward VI, from both of whom he received extensive grants of land, including the manor of Penshurst in Kent, which became the principal residence of the family.Henry Sidney was brought up at court as the companion of Prince Edward, afterwards King Edward VI, and he continued to enjoy the favour of the Crown, serving under Mary I of England and then particularly throughout the reign of Queen Elizabeth I.He was instrumental in the Elizabethan conquest of Ireland, serving as Lord Deputy three times.His career was controversial both at home and in Ireland.
Knowledge 1: Mary Dudley
Mary Sidney (née Dudley) (c. 1530–1535 – 9 August 1586) was a lady-in-waiting at the court of Elizabeth I, and the mother of Sir Philip Sidney and Mary Sidney Herbert, Countess of Pembroke.A daughter of John Dudley, Duke of Northumberland, she was marginally implicated in her father's attempt to place Lady Jane Grey on the English throne and affected by his attainder.Mary Dudley was one of Queen Elizabeth's most intimate confidantes during the early years of her reign.Her duties included nursing the Queen through smallpox in 1563 and acting as her mouthpiece towards diplomats.A sister of Elizabeth's favourite, Robert Dudley, Earl of Leicester, she remained always loyal to her family.She was the mother of seven children and accompanied her husband, Sir Henry Sidney, to Ireland and the Welsh Marches.From the 1570s the couple complained repeatedly about their, as they saw it, poor treatment at the Queen's hands.Still one of Elizabeth's favourite ladies, Mary Dudley retired from court life in 1579, suffering from ill health during her last years. [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: Henry Sidney
Sir Henry Sidney (1529 – 5 May 1586), Lord Deputy of Ireland, was the eldest son of Sir William Sidney of Penshurst, a prominent politician and courtier during the reigns of Henry VIII and Edward VI, from both of whom he received extensive grants of land, including the manor of Penshurst in Kent, which became the principal residence of the family.Henry Sidney was brought up at court as the companion of Prince Edward, afterwards King Edward VI, and he continued to enjoy the favour of the Crown, serving under Mary I of England and then particularly throughout the reign of Queen Elizabeth I.He was instrumental in the Elizabethan conquest of Ireland, serving as Lord Deputy three times.His career was controversial both at home and in Ireland. [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: Sir William Sidney