It may be possible to confirm family relationships by comparing test results with W. 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 37 markers, haplogroup I-M253, FTDNA kit #B488149, MitoYDNA ID T11383[compare] +
Y-Chromosome Test 700 markers, haplogroup I-A8601, MitoYDNA ID Z10525[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test Full Sequence, haplogroup T2b13, FTDNA kit #B488149, MitoYDNA ID T11384[compare]
It is likely that these autosomal DNA test-takers will share some percentage of DNA with W.: