The proposed relationship of Walter Koepke as the father of John Koepke and Ann Koepke is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between BJ (a descendant of the John Koepke ancestral line) and CR (a descendant of the Ann Koepke ancestral line) with a shared segment of 116.49 cM across 5 HIR segments.

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