Nancy Brown had two children by William Avery Rockefeller, Sr., although he was married at the time to Eliza Davison. Nancy and William never married.
Sources
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCY9-B2N : 23 December 2020), Nancy Brown in household of Lyman Brown, Harford, Cortland, New York, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6QH-N5G : 3 March 2021), Nancy Burlingame in household of Lyman Brown, Harford, Cortland, New York, United States; citing p. , line #25, family #14, county clerk offices, New York; FHL microfilm 843,780.
Is Nancy your ancestor? Please don't go away! Login to collaborate or comment, or contact
the profile manager, or ask our community of genealogists a question.