The proposed relationship of Julia Stack as the mother of Elizabeth Sheehy and PS 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 Elizabeth Sheehy ancestral line) and AS (a descendant of the PS ancestral line) with a shared segment of 142.47 cM across 7 HIR segments.

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