And I think I've convinced myself that: James FAIRBAIRN mar. Isabella CAMPBELL (c 1806 Eccles - 1885 Gordon). James died between 1827 and 1837 Isabella remarried to John LAIDLAW bef 1837 (ie after son William FAIRBAIRN born and before son George LAIDLAW born) John Laidlaw and Isabella CAMPBELL/FAIRBAIRN lived Ancrum, Roxburgh Mains, Sprouston, Kelso 1841/51/61/71/81 James Fairbairn and Isabella CAMPBELL had sons John, James, William and Robert This James jnr being the one who married 1) Elizabeth LAIDLAW 2) Mary BRYDON and William being the one married to Hannah BROWN m 1875. This William FAIRBAIRN was the informant for the dth of his mother Isabella LAIDLAW nee CAMPBELL
James & Isabella (CAMPBELL)'s son Robert shows up as a blacksmith in 1851 but I can't find him in 1861, in Scotland anyway
And I haven't tried finding the supposed eldest son John.