"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FQ-BVB : accessed 30 July 2022), Marie L Hooper in household of Henry Y Hooper, Baltimore Ward 11, Baltimore (Independent City), Maryland, United States; citing enumeration district (ED) ED 171, sheet 6A, family 114, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 556; FHL microfilm 1,374,569.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHZ9-6Q2 : accessed 30 July 2022), Marie L H Campion in household of John L Campion, Lower Merion, Montgomery, Pennsylvania, United States; citing enumeration district (ED) ED 60, sheet 10A, line 38, family 179, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2082; FHL microfilm 2,341,816.
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DNA Connections
It may be possible to confirm family relationships with Marie 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 Marie: