"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MWZX-HYW : 22 December 2020), Martha G Sinclair in household of John G Sinclair, Bethlehem, Grafton, New Hampshire, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (accessed 04 March 2021), memorial page for Martha G Norris Sinclair (1799–1880),Find A Grave: Memorial #111892489, citing Glenwood Cemetery, Littleton, Grafton County, New Hampshire, USA ; Maintained by Connie Lagasse Russell (contributor 47359327) .
Lineage and Biographies of the Norris Family in America from 1640 to 1892 ... by Leonard Allison Morrison Page n122
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DNA Connections
It may be possible to confirm family relationships with Martha 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 Martha: