The proposed relationship of Carl Hafferman as the father of
Wilhelm Hafferman and
Ida Haffermann is supported by DNA evidence indicating shared ancestry within the family lines.
Specifically, DNA evidence confirms a 2nd cousin, twice removed relationship between BH (a descendant of the Wilhelm Hafferman ancestral line) and MR (a descendant of the Ida Haffermann ancestral line) with 177.43 cM of shared DNA across 9 HIR segments.
This match is consistent with their placement within these shared ancestral branches.