"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHCP-C3P : accessed 11 March 2016), George Henderson in household of David Henderson, Michigan, United States; citing p. 36, family 272, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,209.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW3L-1TG : accessed 9 February 2016), David Henderson, Springwells, Wayne, Michigan, United States; citing enumeration district ED 264, sheet 406C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0610; FHL microfilm 1,254,610.
"Michigan Death Certificates, 1921-1952," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KFWC-4MV : accessed 11 March 2016), David Henderson in entry for Mary Conroy, 13 Nov 1941; citing Detroit, Wayne, Michigan, United States, Division for Vital Records and Health Statistics, Lansing; FHL microfilm 1,972,898.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: