↑ "New York State Census, 1892," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQSL-R7Q : 6 November 2014), Zelia Vandermark, 1892; citing Hancock, E.D. 04, county offices, New York; FHL microfilm 832,853.
↑ "Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VF9F-4HX : accessed 14 October 2015), Otis Williams and Sarah Gertrude Vandermark, 20 Sep 1905; citing Marriage, Pennsylvania, county courthouses, Pennsylvania; FHL microfilm 955,020.
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DNA Connections
It may be possible to confirm family relationships with Gertrude 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 Gertrude: