S. Reid's reply this week left some unanswered questions, and some confusion for me. I think there may be a connection, but there is a different wife (Helen Rollo), and that does not seem to match. The John Robertson Buried in Lanark who died in 1852, was married to a Janet.
Do you know what property your John (or James) first settled? Do you have any idea of the original land grant?
Thanks again
J.R.