It may be possible to confirm family relationships by comparing test results with Randy or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-DF49, FTDNA kit #511352
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test Full Sequence, haplogroup U5b3b1, FTDNA kit #511352
It is likely that these autosomal DNA test-takers will share DNA with Randy:
AncestryDNA , Ancestry member RandyJHammockOre