It may be possible to confirm family relationships with Rufus by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Rick Pierpont :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-S4056, Ysearch Q98QJ, FTDNA kit #364331 +
Y-Chromosome Test, haplogroup R-S29