So where did the John McKenzie and Jane Turner come from?
As I explained - from an unreliable informant who did not know the names of her great- grandparents.
She had spent very little time around her grandparents, according to the census records.
Unless you are a serious family historian, very few people know the names of their great- grandparents. I tested this on the weekend, and asked my siblings to name their great- grandparents. They had no idea of either first or maiden surnames of great-grandmothers, and knew the obvious surname of only 2 great-grandfathers. Had no idea of their occupations.