Cornell, John. Genealogy of the Cornell Family: Being an Account of the Descendants of Thomas Cornell of Portsmouth, R.I. New York: Press of T.A. Wright, 1902. Page 191.
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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: