The proposed relationship of Susan McCollum as the mother of GH and JH is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a 2nd cousin, once removed relationship between PH (a descendant of the JH ancestral line) and EV (a descendant of the GH ancestral line) with a shared segment of 228.68 cM across 11 HIR segments.

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