"England and Wales Marriage Registration Index, 1837-2005," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:26V3-VF7 : 13 December 2014), Mary M Cooper and null, 1918; from “England & Wales Marriages, 1837-2005,” database, findmypast (http://www.findmypast.com : 2012); citing 1918, quarter 2, vol. 11A, p. 688, Cardiff, Glamorganshire, Wales, General Register Office, Southport, England.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X91R-3PR : 8 April 2016), Maria M Cooper in household of Edwin J Cooper, Roath, Glamorganshire, Wales; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing East Cardiff subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XW6F-3JF : 3 August 2017), Mary Cooper in household of James Cooper, Cardiff, Cardiff, Glamorganshire, Wales; from "1911 England and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 14, The National Archives of the UK, Kew, Surrey.
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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 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: