Mary Sheridan was born about 1838 in Addergoole, Mayo, Ireland to parents Dennis Sheridan and Bridget Malia. She married Owen Jeffers about 1858 in Ireland. Children: John J, Bridget, Martin, James J, Mary, Maggie, Catherine, Kathryn, Thomas. They immigrated to America on 13 May 1863 and settled in Lackawanna, Pennsylvania. Mary died on 5 Oct 1915 in Lackawanna, Pennsylvania.
Sources
US Federal Census 1870, 1880, 1900, 1910
New York Passenger Lists
US Social Security Applications and Claims Index
Pennsylvania Death Certificates
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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: