It may be possible to confirm family relationships by comparing test results with Michael 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 I
Mitochondrial DNA test-takers in the direct maternal line:
Mitochondrial DNA Test HVR1 and HVR2, haplogroup I
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Michael: