Ancestry.com. U.S., Sons of the American Revolution Membership Applications, 1889-1970 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2011.
Original data: Sons of the American Revolution Membership Applications, 1889-1970. Louisville, Kentucky: National Society of the Sons of the American Revolution. Microfilm, 508 rolls.
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with William: