Great questions, Ian. I just got ahold of my Aunt's research, and realized that George MacKay was married 3/28/1809 not died then. He actually died in 1876. His wife, Elspeth Elizabeth was born 1790 My Aunt wrote:
Born about 1790, and married in Eddrachilles, Sutherlandshire, Scotland around 1815, to Elizabeth Sutherland. Family came to Shelburne Nova Scotia, about 1836 later to Gladstone, PEI.
This was confirmed by someone in Canada.
She never got further up the tree than these 2 on the MacKay side.
On the Sutherland side Elspeth's parents were John Sutherland (born1741) and Christy (born 1745) in Goldspie, Sutherland. They were married 7/15/1766. My Aunt is way smarter than I am, so I am adjusting what I need to. This is so interesting, I am becoming glued to my computer!