"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSGV-3YK : accessed 13 January 2016), Dorothy M Abbott in household of George F Abbott, Southold Township, Election District 1, Suffolk, New York, United States; citing sheet 2A, family 25, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,166.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M59F-P8V : accessed 13 January 2016), Dorothy M Abbott in household of William G Abbott, Southold, Suffolk, New York, United States; citing enumeration district (ED) ED 1395, sheet 2B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,095.
"New York State Census, 1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K9P2-4BP : accessed 13 January 2016), Dorothy M Abbott, Southold, Suffolk, New York, United States; from "New York, State Census, 1915," database and images, Ancestry (http://www.ancestry.com : 2012); citing p. 01, line 16, state population census schedules, 1915, New York State Archives, Albany.
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DNA Connections
It may be possible to confirm family relationships with Dorothy by comparing test results with other carriers of her ancestors' mitochondrial DNA.
Mitochondrial DNA test-takers in the direct maternal line: