It is highly unlikely that she is the daughter of Daniel Knowlton and Zerviah Watkins, given that there are no records of Daniel living in Berkshire, Massachusetts and she is not mentioned in any family histories. It is unlikely that she was a Knowlton at all. The only source that states she was a Knowlton are DAR records which are notoriously unreliable.
Mrs. Seviah Dewey (Sevier, wife of David) died 18 Feb 1831 in Richmond, Massachusetts. [1][2]
Sources
↑ 1.01.11.2 Richmond (Mass.). Vital Records of Richmond, Massachusetts: to the Year 1850. Boston: pub. by the New England historic genealogical society, at the charge of the Eddy town-record fund, 1913. pg 96
↑ Massachusetts: Vital Records, 1620-1850 (Online Database: AmericanAncestors.org, New England Historic Genealogical Society, 2001-2016). $
Daughters of the American Revolution, DAR Genealogical Research Databases, database online, (http://www.dar.org/ : accessed June 17, 2017), "Record of DAVID DEWEY", Ancestor # A032238.
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DNA Connections
It may be possible to confirm family relationships with Seviah 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 Seviah: