↑ Macy, Harry Jr. "Robert Jackson's Wives and Children", in The New York Genealogical and Biographical Record. (New York, New York: New York Genealogical and Biographical Society) Vol. 131 Number 1, page 6-7, Jan. 2000.
Robert Jackson contested the will of William Washburn in 1659 on behalf his two daughters, children of a deceased daughter of William. An expense submitted mentioned caring for these daughters for 3 years, leading to the conclusion the mother died 1656. Sarah was the oldest of the two, so born about 1654.