The proposed relationship of Philip Harold Fessler as the father of DDF and PRF is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between KLF (a descendant of the DDF ancestral line) and KF (a descendant of the PRF ancestral line) with a shared segment of 515.50 cM across 21 HIR segments.

This match is consistent with their placement within these shared ancestral branches.