"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNSJ-GJV : 20 February 2021), Sophia Clark in household of Michal Clark, Farmington, Davis, Utah, United States; citing enumeration district ED 15, sheet 294A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,336.
"Utah, County Marriages, 1887-1940", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSPM-9LF : 3 August 2017), Sophia Clark in entry for Charles Clark Willis and Pearl Celia Walker, 1922.
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DNA Connections
It may be possible to confirm family relationships with Sophia 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 Sophia: