It may be possible to confirm family relationships by comparing test results with Steve 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-M269, FTDNA kit #B86069, MitoYDNA ID T14095[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test Full Sequence, haplogroup H6a1a9, FTDNA kit #B86069
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Steve:
AncestryDNA, GEDmatch A352252[compare], Ancestry member bealsey1