Mary was born in 1861. She was the daughter of Robert Dean and Martha Caho. She passed away after 1861.
Sources
Timothy O'Rourke. Maryland Catholics on the Frontier. p.176
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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: