The proposed relationship of Edna Richardson as the mother of Thomas Cragg and Robert Cragg is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a 2nd cousin, once removed relationship between TC (a descendant of the Thomas Cragg ancestral line) and LH (a descendant of the Robert Cragg ancestral line) with a shared segment of 190.95 cM across 7 HIR segments.

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