Hi Chaltis,
Ta for that.
I've only had a quick look and see I"ve a few loose ends in my db that you've given me some good leads for.
I've NOT checked some data I've seen, but back in the Jun 1992 Borders Family History Society magazine #19, there was a query published by a member/researcher who claimed descent from John FAIRBAIRN b 1792, married to Isabella STUART, and showing John as a child of an Andrew FAIRBAIRN and Helen BLAKEBUL.
She assigned these siblings to John:
Andrew and Margaret, baptised 1790 Eccles
Thomas 1798-1873 and
Wilhelmina b 2 Sep 1800.
There were no details on how she was related to John and Isabella, and she was in Ontario.
As children of John and Isabella (STEWART) FAIRBAIRN, I do have confirmed your Helen (marr. Hugh LOCKIE), and also an Andrew marr. to Agnes aka Nancy BROWN. Andrew was also a carter and died Selkirk 1879.
So it does look like this part at least is the same family as your online tree, even if at least back in 1992, there were different interpretations as to how it worked backwards.
I don't know which is correct.
I can also add that there are two William FAIRBAIRN and Margaret SCOTT couples.
The 1750 marriage is the earlier Selkirk one (entry simply reads: "William Fairbairn and Margaret Scott July 20")
The schoolmaster chappie I was referring too, William, uncle to Sir William, was actually baptised in Smailholm in 1756 to John FAIRBAIRN and Helen ANDERSON.