Duncan's Mother Was Nancy, Not Mary

But I think other researchers already knew that.  Misread the death record.

Source

County Houghton
City/village/township Duncan
Last Name Cameron
Given Name Duncan
Birth Year 1824
Age 78
Death Day 17
Death Month Dec
Death Year 1903
Father's Given Name Allen
Father's Last Name Cameron
Informant: Edward Cameron

labelled as "married"

Buried in Sterling [Arenac County, Michigan]