He unsuccessfully contested Berwick-on-Tweed as an independent candidate in the 1918 general election.
Watson married, first, in 1826, a daughter of William Armstrong of Newcastle-on-Tyne, and sister of Lord Armstrong; secondly, in 1831, Mary, daughter of Anthony Hollist of Midhurst, Sussex.
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His grandson William Watson-Armstrong was ennobled as Baron Armstrong in 1903.
Louis Armstrong | Baron | Lance Armstrong | Neil Armstrong | George Armstrong Custer | William Cecil, 1st Baron Burghley | baron | Armstrong Whitworth | Sacha Baron Cohen | Armstrong | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | Henry Brougham, 1st Baron Brougham and Vaux | Guy Carleton, 1st Baron Dorchester | Armstrong College | William Wallace, Baron Wallace of Saltaire | William Tyssen-Amherst, 1st Baron Amherst of Hackney | James Mackay, Baron Mackay of Clashfern | Hercules Robinson, 1st Baron Rosmead | George Brydges Rodney, 1st Baron Rodney | Beechcraft Baron | Thomas Seymour, 1st Baron Seymour of Sudeley | Thomas Denman, 1st Baron Denman | Stuart Rendel, 1st Baron Rendel | Norman Foster, Baron Foster of Thames Bank | John Moore-Brabazon, 1st Baron Brabazon of Tara | Gillian Armstrong | Charles Cochrane-Baillie, 2nd Baron Lamington | Charles Calvert, 5th Baron Baltimore |