Searching for someone else?
Alex Brown's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with Alex or other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 12 markers, haplogroup R-M269, FTDNA kit #10212
It is likely that these autosomal DNA test-takers will share DNA with Alex: