Question: Robert Lowther was an English Member of Parliament, and younger brother of ?

full_context: Document 1: Robert Lowther (1681–1745): Robert Lowther (13 December 1681 – September 1745) was an English landowner, holding the estate of Maulds Meaburn, and colonial governor. He was the eldest son of Richard Lowther and Barbara Prickett.
Document 2: Baron Northbourne: Baron Northbourne, of Betteshanger in the County of Kent, is a title in the Peerage of the United Kingdom. It was created in 1884 for Sir Walter James, 2nd Baronet, who had earlier represented Hull in the House of Commons as a Conservative. His son, the second Baron, sat as a Liberal Member of Parliament for Gateshead. s of 2010 the titles are held by the latter's great-grandson, the fifth Baron, who succeeded his father in 1982. Lord Northbourne is one of the ninety elected hereditary peers that were allowed to remain in the House of Lords after the passing of the House of Lords Act 1999, and sits as a cross-bencher. The James Baronetcy, of Langley Hall, in the County of Berkshire, was created in the Baronetage of Great Britain in 1791 for the first Baron's grandfather Sir Walter James, the last Warden of the Mint. Born Walter James Head, he assumed by Act of Parliament the surname of James only in 1778. His son and heir John James notably served as Minister Plenipotentiary to the Netherlands. The latter was the father of the second Baronet, who was raised to the peerage in 1884.
Document 3: Baron Langdale: Baron Langdale was a title that was created twice in British history. The first creation came in the Peerage of England on 4 February 1658 when the prominent royalist commander of the English Civil War, Sir Marmaduke Langdale, was made by Baron Langdale, of Holme. He had fought alongside Prince Rupert and the Marquess of Newcastle at the Battle of Marston Moor, prior to the war he was the High Sheriff of Yorkshire and in later life a Catholic convert. His son, the second Baron, was Governor of Kingston-upon-Hull. The title descended from father to son until the death of the fifth Baron in 1777. He had no heir as his only son had died as an infant and the title became extinct on his death in 1777. The title commonly had "of Holme" on the end of their title, in reference to Holme-on-Spalding-Moor where they were based at Holme Hall. The name "Langdale" itself was derived from the Langdale hundred of Pickering in the County of York where the ancestors of Marmaduke had come from.
Document 4: Viscount Ullswater: Viscount Ullswater, of Campsea Ashe in the County of Suffolk, is a title in the Peerage of the United Kingdom. It was created in 1921 for James Lowther upon his retirement as Speaker of the House of Commons. He was the eldest son of the Hon. William Lowther, third son of the Hon. Henry Lowther, second son of William Lowther, 1st Earl of Lonsdale (see Earl of Lonsdale and Lowther Baronets for earlier history of the family). The first Viscount lived to the age of 93, and was pre-deceased by both his eldest son the Hon. Christopher Lowther, a Conservative politician, and his eldest son's eldest son John Arthur Lowther (1910–1942) (who was Private Secretary to Prince George, Duke of Kent and was killed in the same air crash as him), the title being inherited by his seven-year-old great-grandson, the second and current Viscount, in an extremely rare instance of a great-grandson succeeding his great-grandfather in a peerage. The second Viscount held office in the Conservative administrations of Margaret Thatcher and John Major and since 2003 he is one of the ninety elected hereditary peers that remain in the House of Lords after the passing of the House of Lords Act 1999. As a descendant of the first Earl of Lonsdale he is also in remainder to this peerage and its subsidiary titles. The current holder of the earldom, Hugh Lowther, 8th Earl of Lonsdale, is Lord Ullswater's fourth cousin.
Document 5: James Erskine, Earl of Mar and Kellie: James Thorne Erskine, 14th Earl of Mar and 16th Earl of Kellie, {'1': ", '2': ", '3': ", '4': "} (born 10 March 1949) is a British peer and former Liberal Democrat member of the House of Lords.
Document 6: Robert and Thomas Wintour: Robert Wintour (1568 – 30 January 1606) and Thomas Wintour (1571 or 1572 – 31 January 1606), also spelt Winter, were members of the Gunpowder Plot, a failed conspiracy to assassinate King James I. Brothers, they were related to other conspirators, such as their cousin, Robert Catesby, and a half-brother, John Wintour, also joined them following the plot's failure. Thomas was an intelligent and educated man, fluent in several languages and trained as a lawyer, but chose instead to become a soldier, fighting for England in the Low Countries, France, and possibly in Central Europe. By 1600, however, he changed his mind and became a fervent Catholic. On several occasions he travelled to the continent and entreated Spain on behalf of England's oppressed Catholics, and suggested that with Spanish support a Catholic rebellion was likely.
Document 7: Francis Mathew, 2nd Earl Landaff: Francis James Mathew, 2nd Earl Landaff KP (20 January 1768 – 12 March 1833), styled The Honourable Francis Mathew from 1783 to 1797 and Viscount Mathew from 1797 to 1806, was an Irish peer and politician.
Document 8: Robert Bewick: Robert Elliot Bewick (1788–1849) was the son of the engraver Thomas Bewick. He was trained in engraving by his father, but is primarily remembered now as a player of the Northumbrian smallpipes.
Document 9: Baron Muncaster: Baron Muncaster was a title in the Peerage of Ireland and in the Peerage of the United Kingdom held by the Pennington family. This family, of Muncaster Castle in Cumberland, descended from William Pennington, who was created a Baronet, of Muncaster in the County of Cumberland, in the Baronetage of England in 1676. He was succeeded by his son, the second Baronet. He represented Cumberland in the House of Commons. His son, the third Baronet, also sat as Member of Parliament for this constituency. He died childless and was succeeded by his younger brother, the fourth Baronet. On his death the title passed to his son, the fifth Baronet. He was Member of Parliament for Milborne Port and Colchester. In 1783, ten years before he succeeded his father in the baronetcy, he was raised to the Peerage of Ireland as Baron Muncaster, with remainder in default of male issue of his own to his younger brother Lowther Pennington and the heirs male of his body.
Document 10: James Lowther, 1st Earl of Lonsdale: James Lowther, 1st Earl of Lonsdale (5 August 1736 – 24 May 1802) was an English politician and landowner. He was a Member of Parliament for over twenty years before, in 1784, he was raised to the Peerage of Great Britain as Earl of Lonsdale.
Document 11: William Lowther (1668–1694): William Lowther (17 June 1668 – 28 July 1694) was an English Member of Parliament, the posthumous son of John Lowther and his second wife, Mary Withins.
Document 12: Charles Pratt, 1st Earl Camden: Charles Pratt, 1st Earl Camden, PC (baptised 21 March 1714 – 18 April 1794) was an English lawyer, judge and Whig politician who was first to hold the title of Earl Camden. As a lawyer and judge he was a leading proponent of civil liberties, championing the rights of the jury, and limiting the powers of the State in leading cases such as "Entick v Carrington".
Document 13: Robert Levet: Robert Levet (1705–1782), a Yorkshireman who became a Parisian waiter, then garnered some training as an apothecary and moved to London, was eulogised by the poet Samuel Johnson, with whom Levet shared a friendship of thirty-six years, in Johnson's poem "On the Death of Dr. Robert Levet."
Document 14: Robert Lowther (1741–1777): Robert Lowther (1741–1777) was an English Member of Parliament, the younger son of Robert Lowther and Catherine Pennington and younger brother of James Lowther, 1st Earl of Lonsdale.
Document 15: Earl Belmore: Earl Belmore, in County Fermanagh, Northern Ireland, is a title in the Peerage of Ireland created in 1797 for Armar Lowry-Corry, 1st Viscount Belmore, who had previously represented County Tyrone in the Irish House of Commons. He had already been created Baron Belmore, of Castle Coole in County Fermanagh, in 1781 and Viscount Belmore in 1789, also in the Peerage of Ireland. Born Armar Lowry, he was the son of Galbraith Lowry, Member of the Irish House of Commons for County Tyrone, and his wife Sarah, daughter of Colonel John Corry. In 1774 he assumed by Royal licence the additional surname of Corry. He was succeeded by his eldest son, the second Earl. He represented County Tyrone in both the Irish and British House of Commons, sat in the House of Lords as an Irish Representative Peer from 1819 to 1841 and served as Governor of Jamaica from 1828 to 1832.
ground_truth: James Lowther, 1st Earl of Lonsdale