Question: Who is Thomas Watson, 3Rd Earl Of Rockingham's paternal grandfather?

Knowledge 1: Thomas Watson, 3rd Earl of Rockingham
Thomas Watson, 3rd Earl of Rockingham (30 December 1715 – 26 February 1746), styled Hon.Thomas Watson until 1745, was an English nobleman and politician.He represented Canterbury in the House of Commons and was appointed Lord Lieutenant of Kent after succeeding to the earldom, but died shortly thereafter.The second son of Edward Watson, Viscount Sondes, Watson entered Eton College in 1725 and Lincoln's Inn in 1732.In the 1741 British general election, he stood for Canterbury as an opposition Whig.Watson and the ToryThomas Best ousted the incumbent Sir Thomas Hales, a Whig supporter of Walpole's administration.He continued in opposition to successive governments during his tenure in the House of Commons, which terminated in 1745 when he became Earl of Rockingham on the death of his elder brother Lewis.Despite his politics, he was appointed Lord Lieutenant of Kent in succession to his brother, but did not long survive the appointment, dying on 26 February 1746.Rockingham never married, and upon his death, the titles of Earl of Rockingham, Viscount Sondes, and Baron Throwley became extinct.He was succeeded as Baron Rockingham by Thomas Watson-Wentworth, 1st Earl of Malton, his first cousin once removed.Rockingham left his estate to his first cousin Lewis Monson, who thereafter adopted the surname of Watson. [SEP] Knowledge 2: Edward Watson, Viscount Sondes
Edward Watson, Viscount Sondes (3 July 1686 – 20 March 1722) of Lees Court, Sheldwich, Kent, and Park Place, London, was a British Whig politician who sat in the House of Commons between 1708 and 1722.Watson was the eldest son of Lewis Watson, 1st Earl of Rockingham and his wife Catherine Sondes, daughter of George Sondes, 1st Earl of Feversham.He matriculated at Merton College, Oxford on 1 June 1703, aged 16 and travelled abroad to Germany in 1707.Watson arrived back from Germany in 1708, in time to be elected as a Whig Member of Parliament for Canterbury at the 1708 British general election.He proposed a motion on 25 January 1709 for an address to the Queen that she should consider remarrying.He also supported the naturalization of the Palatines.He was appointed to a committee to draft a bill to limit the time allowed for public mourning, since this was felt to be having an adverse effect on Canterbury’s silk trade.He also voted for the impeachment of Dr Sacheverell and possibly in consequence he lost his seat at the 1710 British general election.He was returned unopposed as MP for New Romney at a by-election on 20 April 1713.Following his father's elevation as Earl of Rockingham in 1714, he was styled Viscount Sondes.In 1718, he went over to the Opposition and in 1719 he was appointed a Gentleman of the Bedchamber to the Prince of Wales.Watson died in 1722, predeceasing his father by 2 years.He married Catherine Tufton, eldest daughter of Thomas Tufton, 6th Earl of Thanet in 1709, and had three sons and a daughter:
In 1729 his widow and her four sisters became co-heiresses to the Barony of Clifford.The abeyance was terminated in 1734 for the third sister Margaret, wife of Lord Lovel, but following her death without surviving issue in 1775 the barony was restored in favour of Viscount Sondes' grandson Edward Southwell, 20th Baron Clifford.
Knowledge 1: Thomas Watson, 3rd Earl of Rockingham
Thomas Watson, 3rd Earl of Rockingham (30 December 1715 – 26 February 1746), styled Hon.Thomas Watson until 1745, was an English nobleman and politician.He represented Canterbury in the House of Commons and was appointed Lord Lieutenant of Kent after succeeding to the earldom, but died shortly thereafter.The second son of Edward Watson, Viscount Sondes, Watson entered Eton College in 1725 and Lincoln's Inn in 1732.In the 1741 British general election, he stood for Canterbury as an opposition Whig.Watson and the ToryThomas Best ousted the incumbent Sir Thomas Hales, a Whig supporter of Walpole's administration.He continued in opposition to successive governments during his tenure in the House of Commons, which terminated in 1745 when he became Earl of Rockingham on the death of his elder brother Lewis.Despite his politics, he was appointed Lord Lieutenant of Kent in succession to his brother, but did not long survive the appointment, dying on 26 February 1746.Rockingham never married, and upon his death, the titles of Earl of Rockingham, Viscount Sondes, and Baron Throwley became extinct.He was succeeded as Baron Rockingham by Thomas Watson-Wentworth, 1st Earl of Malton, his first cousin once removed.Rockingham left his estate to his first cousin Lewis Monson, who thereafter adopted the surname of Watson. [SEP] Knowledge 2: John Lindsay, 19th Earl of Crawford
John Lindsay, 19th Earl of Crawford and 3rd Earl of Lindsay( died December 1713) was a Scottish peer and politician.
Knowledge 1: Thomas Watson, 3rd Earl of Rockingham
Thomas Watson, 3rd Earl of Rockingham (30 December 1715 – 26 February 1746), styled Hon.Thomas Watson until 1745, was an English nobleman and politician.He represented Canterbury in the House of Commons and was appointed Lord Lieutenant of Kent after succeeding to the earldom, but died shortly thereafter.The second son of Edward Watson, Viscount Sondes, Watson entered Eton College in 1725 and Lincoln's Inn in 1732.In the 1741 British general election, he stood for Canterbury as an opposition Whig.Watson and the ToryThomas Best ousted the incumbent Sir Thomas Hales, a Whig supporter of Walpole's administration.He continued in opposition to successive governments during his tenure in the House of Commons, which terminated in 1745 when he became Earl of Rockingham on the death of his elder brother Lewis.Despite his politics, he was appointed Lord Lieutenant of Kent in succession to his brother, but did not long survive the appointment, dying on 26 February 1746.Rockingham never married, and upon his death, the titles of Earl of Rockingham, Viscount Sondes, and Baron Throwley became extinct.He was succeeded as Baron Rockingham by Thomas Watson-Wentworth, 1st Earl of Malton, his first cousin once removed.Rockingham left his estate to his first cousin Lewis Monson, who thereafter adopted the surname of Watson. [SEP] Knowledge 2: Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.

Answer: Lewis Watson, 1st Earl of Rockingham