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

Specifically, DNA evidence confirms a Distant cousin relationship between MFF (a descendant of the John Sheehy ancestral line) and JL (a descendant of the Ellen Sheehy ancestral line), with a shared segment of 49.59 cM across 4 HIR segments. This match is consistent with their placement within these shared ancestral branches.