It may be possible to confirm family relationships by comparing test results with Craig 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 111 markers, haplogroup R-BY88844, FTDNA kit #782868, MitoYDNA ID T10806[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test Full Sequence, haplogroup H1C, FTDNA kit #782868, MitoYDNA ID T10807[compare]