The proposed relationship of Katharina Wiens as the mother of
Maria Harder and
Katharina Reimer is supported by DNA evidence indicating shared ancestry within the family lines.
Specifically, DNA evidence confirms a 3rd cousin, twice removed relationship between DJG (a descendant of the Maria Harder ancestral line) and JDE (a descendant of the Katharina Reimer ancestral line) with 76.50 cM of shared DNA across 6 HIR segments.
This match is consistent with their placement within these shared ancestral branches.