Wolfram, Joydelle Garrett, compiler. An Updated Genealogy: the descendants of #194, Aaron and Elizabeth Harlan; one line of descendants of George Harlan, who settled in Chester County Pennsylvania, in 1687. N.p: n.p., 1990.
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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: