It may be possible to confirm family relationships by comparing test results with Jay or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Y-Chromosome Test, haplogroup R-A14351
Mitochondrial DNA test-takers in the direct maternal line:
Mitochondrial DNA Test, haplogroup H4a1a1a, Ancestry member aaiou150