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It may be possible to confirm family relationships by comparing test results with Albertus Robert Casimir or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Albertus Robert Casimir (Fuller) Jung:
Family Tree DNA Y-DNA Test 37 markers, haplogroup R-M269, FTDNA kit #H1208