NOTES: See notes on her father, Joseph Underwood. Her death date approximation stems from Isaac's 1698 will, which refers to his "wife Sarah." The Ong records say this is Sarah Underwood. The Underwood history has no dates or marriage information for Sarah, but does suggest she was younger than Mary, so I will assume, for now, that Sarah Underwood was the wife who survived Isaac Ong in 1698. In any event, Mary was the mother of all children shown here.