The proposed relationship of Sarah Ann Carr as the mother of ET and GMT is supported by DNA evidence indicating shared ancestry within the family lines.
Specifically, DNA evidence confirms a distant cousin relationship between LC (a descendant of the ET ancestral line) and WK (a descendant of the GMT ancestral line) with 177.56 cM of shared DNA across 8 HIR segments.
This match is consistent with their placement within these shared ancestral branches.