It may be possible to confirm family relationships by comparing test results with Evan 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 12 markers, haplogroup J-L174.1, FTDNA kit #293558
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test HVR1 and HVR2, haplogroup T2, FTDNA kit #293558
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Evan: