Adelaide Williamson was born about 1858 in Sag Harbor, East Hampton, Suffolk, New York, United States, daughter of John M. Williamson (~1820 - <1875) and Maria A. (Goodale) Williamson (~1825 - 1906).
Adelaide only appears in thr 1860 U.S. Census and, importantly not the 1865 New York census where her other siblings were listed. Assuming she died before 1865.
Sources
1860 U.S. Census, Suffolk County, New York, Southhampton Township, Population Schedule, p. 8, lines 4-11, dwelling 55, family 56, John Williamson Household; image, Ancestry.com (http://www.ancestry.com : accessed 7 Dec 2021); citing 1860 U.S. census, population schedule. NARA microfilm publication M653, 1,438 rolls. Washington, D.C.: National Archives and Records Administration, n.d.
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DNA Connections
It may be possible to confirm family relationships with Adelaide by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Adelaide: