Michael Clark's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with Michael or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
It is likely that these autosomal DNA test-takers will share DNA with Michael:
23andMe, GEDmatch YC4852266 [compare] +
AncestryDNA, GEDmatch A116025 [compare], Ancestry member cl2clark +
Family Tree DNA Family Finder, FTDNA kit #B155093