George Dunning's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with George 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 #39037
It is likely that these autosomal DNA test-takers will share DNA with George: