Hi Ron et al.
I too am interested in the Hairstones of Thornhill as they feature in my research.  
I have a Jannet Hairstones b1801marrying William Bryden b1800 on the 26/07/1822 in Morton by Thornhill.  One of their children, Charles b1831 d1903, is my GGGrandfather.
I can find Jannet in the 1841 census at Thornhill West Side Of South Drumlanrig Street with her children, however William is not shown on that record, nor can I find a record of his death.  He is shown on Charles's marriage certificate as 'deceased' in 1858.  Charles at this time lived in Egremont, Cumbria.
I've attached a screen shot of my tree if it helps.  Any feedback on either Jannet or William would be greatly appreciated
David