I think my wife has some Fairbairn connections who lived around Brockville/Teeswater and Darlington Ontario. The names you mention are not on her copy of the family tree but there are many gaps where it says things like 7 sons & 3 daughters and then follows the line of only one of them. Present day ones seem to be in San Francisco, Buffalo and presumably still in Canada. The first record we have is John F married to Elizabeth Yule, emmigrated to Darlington Ontario in 1824. If this is of any help let me know and I can gfive you the other info off the Tree.