According to the referenced, the marriage date provided could not be verified but they are confidant the marriage happened.
Sources
Herbert I. Brackett; Anthony Brackett of Portsmouth and Captain Richard Brackett of Braintree with Biographies of the Immigrant Fathers, their sons, and others of their posterity. H. I. Brackett, Washington D.C. 1907
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DNA Connections
It may be possible to confirm family relationships with Sarah 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 Sarah: