Hi Canadagal
Last time I was at the Records Office in Edinburgh I did some research on Alexander Gibson of Glencrosh, the tenant of Gilchristland farm, wondering if he might tie in to my family - no links so far though!
He died on 15 December 1851 and in his will left bequests to the surviving children of his deceased siblings Robert, Ann, Margaret, Sarah and Elizabeth. Robert's daughter was Mary Gibson McTurk. Wonder if any of these names coincide with children of the Alexander Gibson you are looking for?
Incidentally, I was looking for my 3x gt grandfather Alexander Gibson who was a farmer, married in Closeburn in 1793 to Ann Brown. Still haven't tracked him down!
Geoff