DAR records have his mother as Ruth Bradford, not Alice Clark.
Sources
↑ Ancestry.com. Massachusetts, U.S., Wills and Probate Records, 1635-1991 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2015 Franklin County Probate Files, Ca. 1812-1915 (Franklin County, Massachusetts); Author: Massachusetts. Probate Court (Franklin County); Probate Place: Franklin, Massachusetts, Case Number: 4038.
See also:
Ancestry.com. Mayflower Births and Deaths, Vol. 1 and 2 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2013.
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DNA Connections
It may be possible to confirm family relationships with Clark by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Per Sons of American Revolution application for Clark Hamilton Sampson #3838 submitted 1/24/1893, approved 6/5/1894 and membership delivered 7/27/1894 the following genealogy given per family records and State of Massachusetts records: Jason Sampson married Ruth Bradford and had Clark Sampson who married Mercy Hamilton and had Elijah N Sampson who married Agness Hubbbard who had Clark Hamilton Sampson