Question: Who did the grandson of the Earl of Sunderland (from 1822-1840) marry?

Context articles: Descendants of Winston Churchill
Whig Junto
Earl of Sunderland
John Spencer-Churchill, 7th Duke of Marlborough
First Stanhope–Sunderland ministry
Britannia (1783 ship)
Penshaw Monument
Whizgig
Robert Spencer, 4th Earl of Sunderland
Earl of Bantry

Sir Winston Churchill, son of Lord Randolph Churchill and grandson of John Spencer-Churchill, 7th Duke of Marlborough, was Prime Minister of the United Kingdom between 26 October 1951 – 6 April 1955 and 10 May 1940 – 26 July 1945.
 In 1908, Churchill married Clementine Hozier, the daughter of Sir Henry and Lady Blanche Hozier.
 By Clementine, Churchill had five children and ten grandchildren, a number of whom are well known in their own right.
The Whig Junto is the name given to a group of leading Whigs who were seen to direct the management of the Whig Party and often the government, during the reigns of William III and Anne.
 The Whig Junto proper consisted of John Somers, later Baron Somers; Charles Montagu, later Earl of Halifax; Thomas Wharton, later Marquess of Wharton, and Edward Russell, later Earl of Orford.
 They came to prominence due to the favour of Robert Spencer, 2nd Earl of Sunderland and during the reign of Queen Anne, Sunderland's son, the 3rd Earl succeeded his father.
 Opponents gave them the nickname "the five tyrannising lords".
 Other figures prominent around the edges of the Junto include Sir John Trenchard and Thomas Tollemache.
Earl of Sunderland is a title that has been created twice in the Peerage of England.
 The first creation came in 1627 in favour of Emanuel Scrope, 12th Baron Scrope of Bolton.
 The earldom became extinct on his death in 1630 while the barony became either extinct or dormant (see Baron Scrope of Bolton for more information on this title).
 The second creation came in 1643 in favour of the Royalist soldier Henry Spencer, 3rd Baron Spencer of Wormleighton.
 The Spencer family descended from Sir John Spencer (d. 1522) who acquired the Wormleighton estate in Warwickshire and the Althorp estate in Northamptonshire.
 His grandson Sir John Spencer (d. 1586) was a Knight of the Shire for Northamptonshire.
 The latter's grandson Sir Robert Spencer represented Brackley in Parliament in the late 16th century.
 In 1603 Sir Robert was raised to the Peerage of England as Baron Spencer of Wormleighton.
 He was succeeded by his eldest surviving son, William, the second Baron.
 He had previously represented Northamptonshire in Parliament.
 His eldest son was the aforementioned third Baron.
 In July 1643 he was created Earl of Sunderland in the Peerage of England.
 Lord Sunderland was killed at the Battle of Newbury in September of the same year.
 He was succeeded by his two-year-old only son, Robert, the second Earl.
 He later gained great distinction as a statesman and notably served four times as Secretary of State for the Southern Department.
John Winston Spencer-Churchill, 7th Duke of Marlborough (2 June 1822 – 4 July 1883), styled Earl of Sunderland from 1822 to 1840 and Marquess of Blandford from 1840 to 1857, was a British Conservative cabinet minister, politician, and nobleman.
 He was the paternal grandfather of Prime Minister Sir Winston Churchill.
Robert Walpole and Charles Townshend, 2nd Viscount Townshend were removed from their positions in the government (the latter having already previously been demoted to Lord Lieutenant of Ireland), and were replaced by James Stanhope, 1st Viscount Stanhope of Mahon and Charles Spencer, 3rd Earl of Sunderland, who cooperatively led the first Stanhope–Sunderland ministry.
 The two Whigs remained in power from 1717 to 1721, although in 1718, Lord Stanhope exchanged positions with Lord Sunderland to form the second Stanhope–Sunderland ministry.
 Upon Lord Stanhope's death, Robert Walpole, widely considered the first true Prime Minister of Great Britain, returned to head the government.
Britannia was a ship launched at Sunderland in 1783.
 In 1791 she received a three-year license from the British East India Company to engage in whaling in the South Pacific and off New South Wales.
 She does not appear to have engaged in whaling but instead shuttled between Port Jackson and other ports bringing supplies to the new colonies.
 Shortly after her return to Britain in 1797 she temporarily disappeared from "Lloyd's Register".
 From 1800 to 1822 she was a Greenland whaler, and then from 1822 to 1837 she was a Southern Whale fishery whaler.
 Between 1840 and 1844 she was a London-based collier.
 After a 61-year career, she was no longer listed in 1845.
The Penshaw Monument ( ), officially The Earl of Durham's Monument, is a folly built in 1844 on Penshaw Hill between the districts of Washington and Houghton-le-Spring, within the City of Sunderland, North East England.
 It is dedicated to John Lambton (1792–1840), 1st Earl of Durham and the first Governor of the Province of Canada.
Whizgig (1819–1840) was a British Thoroughbred racehorse and broodmare who won the classic 1000 Guineas at Newmarket in 1822.
 In a racing career which lasted from April 1822 until May 1824 she ran fourteen times and won seven races.
 Unraced as a two-year-old, Whizgig won six of her seven races in 1822, her only defeat coming in the Oaks Stakes.
 She remained in training for a further two seasons, but was less successful, winning only one more race.
 She later became a successful broodmare.
Robert Spencer, 4th Earl of Sunderland (24 October 1701 – 15 September 1729) was a British peer from the Spencer family, the son of the Whig politician, Charles Spencer, 3rd Earl of Sunderland.
 His mother was Lady Anne Churchill, the daughter of John Churchill, 1st Duke of Marlborough and Sarah Churchill, Duchess of Marlborough.
 Known as Lord Spencer between 1702 and 1722, he succeeded to the Earldom after his father's death in, but died in 1729 with no children.
 Therefore, his brother, Charles, became 5th Earl of Sunderland, and subsequently 3rd Duke of Marlborough after the death of his aunt, Henrietta Godolphin ("née" Churchill), 2nd Duchess of Marlborough.
Earl of Bantry, of Bantry in the County of Cork, was a title in the Peerage of Ireland.
 It was created in 1816 for Richard White, 1st Viscount Bantry, who had helped repelling the French invasion at Bantry Bay in 1797.
 He had already been created Baron Bantry, of Bantry in the County of Cork, and Viscount Bantry, of Bantry in the County of Cork, in 1800, and was made Viscount Berehaven at the same time he was given the earldom.
 These titles were also in the Peerage of Ireland.
 He was the grandson of Richard White, who had made an immense fortune through his work as a lawyer.
 Lord Bantry was succeeded by his son, the second Earl.
 He sat on the Conservative benches in the House of Lords as an Irish Representative Peer from 1854 to 1868.
 His younger brother, the third Earl, assumed in 1840 by Royal licence the additional surname of Hedges, which was that of his paternal grandmother.
 He was an Irish Representative Peer from 1869 to 1884.
 The titles became extinct on the death of his son, the fourth Earl, in 1891.