The proposed relationship of Betty Stern as the mother of Thomas Bowles and GB is supported by DNA evidence indicating shared ancestry within the family lines.

Specifically, DNA evidence confirms a distant cousin relationship between JKH (a descendant of the Thomas Bowles ancestral line) and SLD (a descendant of the GB ancestral line) with a shared segment of 42.22 cM across 3 HIR segments.

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