Hello kjmoore
Yes, I have a tree that starts with William Mathieson who married Mary Mackie in August 1743.
Until earlier this week I thought it was the correct line for my ancestors, however by checking with the 1841 census, I realised that George's son Alexander had either a brother or cousin named John Mathieson who married Mary Mortimer 11 November 1818.
Alexander married Christian Kemp, date I don't have and they had 8 children all born in Oyne. My tree now stops at that point.
If you have George (1744 to 1820) having more sons than just Alexander (1789 to 1870) I would be most interested as I have been attempting to trace John and Mary in recent days.
Cheers
Ian