Question: Who is the sibling-in-law of Harriet Pelham-Holles, Duchess Of Newcastle-Upon-Tyne?

Knowledge 1: Harriet Pelham-Holles, Duchess of Newcastle-upon-Tyne
Henrietta "Harriet" Pelham-Holles, Duchess of Newcastle-upon-Tyne (1701– 17 July 1776)wasthe wife of the British statesman and Prime Minister Thomas Pelham-Holles, 1st Duke of Newcastle-upon-Tyne.She was the daughter of Francis Godolphin, 2nd Earl of Godolphin and
Lady Henrietta Churchill, 2nd Duchess of Marlborough and the granddaughter of Sidney Godolphin, 1st Earl of Godolphin and John Churchill, 1st Duke of Marlborough and Sarah Churchill, Duchess of Marlborough.Until her marriage she was known as Lady Harriet Godolphin.Like her husband, she was a devoted Whig and supporter of the Hanoverian succession.They married on 2 April 1717.During the 1720s, they became famous for throwing sumptuous parties, a tradition that continued for several decades.These were attended even by her husband's political opponents. [SEP] Knowledge 2: Thomas Pelham-Holles, 1st Duke of Newcastle
Thomas Pelham-Holles, 1st Duke of Newcastle upon Tyne and 1st Duke of Newcastle-under-Lyme, (21 July 1693 – 17 November 1768) was a British Whig statesman, whose official life extended throughout the Whig supremacy of the 18th century.He is commonly known as the Duke of Newcastle.A protégé of Sir Robert Walpole, he served under him for more than 20 years until 1742.He held power with his brother, Prime Minister Henry Pelham, until 1754.He had then served as a Secretary of State continuously for 30 years and dominated British foreign policy.After Henry's death, the Duke of Newcastle was prime minister six years in two separate periods.While his first premiership was not particularly notable, Newcastle precipitated the Seven Years' War, and his weak diplomacy cost him the premiership.After his second term, he served briefly in Lord Rockingham's ministry, before he retired from government.He was most effective as a deputy to a leader of greater ability, such as Walpole, his brother, or Pitt.Few politicians in British history matched his skills and industry in using patronage to maintain power over long stretches of time.His genius appeared as the chief party manager for the Whigs from 1715 to 1761.He used his energy and his money to select candidates, distribute patronage and win elections.He was especially influential in the counties of Sussex, Nottinghamshire, Yorkshire and Lincolnshire.His greatest triumph came in the 1754 election.Outside the electoral realm, his reputation has suffered.Historian Harry Dickinson says that he became
Knowledge 1: Thomas Pelham-Holles, 1st Duke of Newcastle
Thomas Pelham-Holles, 1st Duke of Newcastle upon Tyne and 1st Duke of Newcastle-under-Lyme, (21 July 1693 – 17 November 1768) was a British Whig statesman, whose official life extended throughout the Whig supremacy of the 18th century.He is commonly known as the Duke of Newcastle.A protégé of Sir Robert Walpole, he served under him for more than 20 years until 1742.He held power with his brother, Prime Minister Henry Pelham, until 1754.He had then served as a Secretary of State continuously for 30 years and dominated British foreign policy.After Henry's death, the Duke of Newcastle was prime minister six years in two separate periods.While his first premiership was not particularly notable, Newcastle precipitated the Seven Years' War, and his weak diplomacy cost him the premiership.After his second term, he served briefly in Lord Rockingham's ministry, before he retired from government.He was most effective as a deputy to a leader of greater ability, such as Walpole, his brother, or Pitt.Few politicians in British history matched his skills and industry in using patronage to maintain power over long stretches of time.His genius appeared as the chief party manager for the Whigs from 1715 to 1761.He used his energy and his money to select candidates, distribute patronage and win elections.He was especially influential in the counties of Sussex, Nottinghamshire, Yorkshire and Lincolnshire.His greatest triumph came in the 1754 election.Outside the electoral realm, his reputation has suffered.Historian Harry Dickinson says that he became [SEP] Knowledge 2: Margaret Holles, Duchess of Newcastle-upon-Tyne
Margaret Holles, Duchess of Newcastle-upon-Tyne ("née" Cavendish, 22 October 1661 – 24 December 1715/16, London) was an English noblewoman.She was the third daughter and fourth of six children of Henry Cavendish, 2nd Duke of Newcastle-upon-Tyne and his wife, Frances Pierrepoint.On 1 March 1690, she married John Holles, Earl of Clare.Her husband was created Duke of Newcastle in 1694, the first creation having become extinct in 1691 when her father died without a male heir (her only brother, Henry Cavendish, Earl of Ogle, died in 1680).They had one child, Lady Henrietta Cavendish Holles (1694–1755), who married 2nd Earl of Oxford and Mortimer and was mother to Margaret Bentinck, Duchess of Portland.She died in 1715/16 and was buried at Bolsover Castle.
Knowledge 1: Harriet Pelham-Holles, Duchess of Newcastle-upon-Tyne
Henrietta "Harriet" Pelham-Holles, Duchess of Newcastle-upon-Tyne (1701– 17 July 1776)wasthe wife of the British statesman and Prime Minister Thomas Pelham-Holles, 1st Duke of Newcastle-upon-Tyne.She was the daughter of Francis Godolphin, 2nd Earl of Godolphin and
Lady Henrietta Churchill, 2nd Duchess of Marlborough and the granddaughter of Sidney Godolphin, 1st Earl of Godolphin and John Churchill, 1st Duke of Marlborough and Sarah Churchill, Duchess of Marlborough.Until her marriage she was known as Lady Harriet Godolphin.Like her husband, she was a devoted Whig and supporter of the Hanoverian succession.They married on 2 April 1717.During the 1720s, they became famous for throwing sumptuous parties, a tradition that continued for several decades.These were attended even by her husband's political opponents. [SEP] Knowledge 2: Margaret Holles, Duchess of Newcastle-upon-Tyne
Margaret Holles, Duchess of Newcastle-upon-Tyne ("née" Cavendish, 22 October 1661 – 24 December 1715/16, London) was an English noblewoman.She was the third daughter and fourth of six children of Henry Cavendish, 2nd Duke of Newcastle-upon-Tyne and his wife, Frances Pierrepoint.On 1 March 1690, she married John Holles, Earl of Clare.Her husband was created Duke of Newcastle in 1694, the first creation having become extinct in 1691 when her father died without a male heir (her only brother, Henry Cavendish, Earl of Ogle, died in 1680).They had one child, Lady Henrietta Cavendish Holles (1694–1755), who married 2nd Earl of Oxford and Mortimer and was mother to Margaret Bentinck, Duchess of Portland.She died in 1715/16 and was buried at Bolsover Castle.

Answer: Henry Pelham