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He was almost certainly related (at least distantly) to Brian Clouston, Sir Edward Clouston, 1st Baronet, Storer Clouston and William Alexander Clouston, as the surname Clouston is (according to Storer Clouston in his book Family of Clouston) exclusive to descendants of Haakon Harvardson Klo, from whom the name derives.
Some prominent members were identified as the "great team" in Richard Dorson's now long outdated 1967 history of British folklore, late-Victorian leaders of the surge of intellectual interest in the field, these were Andrew Lang, Edwin Sidney Hartland, A. Nutt, William Alexander Clouston, Edward Clodd and Gomme.