"Scotland Marriages, 1561-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XTLX-QDJ : 8 December 2014), Alexander Duncan and Mary Todd, 31 Dec 1845; citing Rothesay,Bute,Scotland, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,041,086.
"Scotland Births and Baptisms, 1564-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XTJ8-NYJ : 2 January 2015), Mary Todd in entry for William Duncan, 15 Dec 1850; citing , reference 2:15DPL1S, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,041,086.
"Scotland Births and Baptisms, 1564-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XTJ8-K3K : 2 January 2015), Mary Todd in entry for Janet Millar Duncan, 24 Feb 1849; citing , reference 2:15DPG9R, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,041,086.
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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: