Mary is the sister to Barbara Elizabeth Le Gro Knapp who is the great grandmother of Joan Hanson Landreth
Sources
United States Census, 1860
Minnesota States Census, 1895
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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: