Betsy and I have convinced each other that she has found yet another dtr for David FAIRBAIRN and Jane HERD. The Jane TRACY who married David & Jane's son Archibald had a brother George who is listed on ancestral file as marrying a Martha FAIRBORN, who just happened to be born St Mary, Perth, Ontario, 1834. Looks like another example of siblings marrying siblings. The circumstantial evidence includes the fact that in the 1870 census George and Martha have moved from Perth to Mt Morris, Wisconsin, which just happens to be where David and Jane are now living as well. A George and Elizabeth of an age to be his parents are also with them.
In 1870 George and Martha are shown with two children, Anna and George, both born Canada. Betsy excelled herself and found an Annie of the right age, with parents given as George and Martha, marrying back in St Marys, Perth, to a clergyman Robert O KELLOGG.
Darned if I can find the TRACY family in Canada in 1851 though, or anywhere in 1880. It looks as if Anna/Annie died in California about 1886 and their only dtr shortly before that.
In the process of ferreting around in Ontario records, several more twigs have also been added/updated on the Quebec FAIRBAIRNs (mainly the family of Clarissa Harlow FAIRBAIRN and Elihu Robert MARSTON, but several others as well).
Also found another dtr for the family of John FAIRBAIRN and Margaret SINTON, a Rachel popped up with them in 1851, and I later found her 1929 death in Blandford, Ontario.
Depending of course on when you are reading this, any of the links above pointing to WorldConnect wont necessarily show the updates, as I haven't uploaded them yet, but any pointing to charts on my domain web pages have been.