Notes
Nancy's father's will, proved in 1777, states that she is under age, leading to the range in her birth years (source: [2])
Sources:
[1] - Inferred from Watson Kirkconnell, 1976, "Climbing the Green Tree and Some Other Branches", Watson Kirkconnell, Wolfville, Nova Scotia.
[2] - Watson Kirkconnell, 1976, "Climbing the Green Tree and Some Other Branches", Watson Kirkconnell, Wolfville, Nova Scotia.