The maternal relationship between Katarina Eriksson and her daughter Karin Doris Ingeborg Nordin is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant NAS.

The segmental (via DNA segment triangulation) and total DNA shared between NAS and other confirmed descendants of Per Estensson is consistent with the expected ranges for their respective relationships. Since NAS descends from Per Estensson through Katarina Eriksson and her daughter Karin Doris Ingeborg Nordin, the presence of significant shared DNA between NAS and other known descendants of Per Estensson validates the generational links along this maternal line.

This supports the conclusion that DNA was passed from MRCA Per Estensson through Katarina Eriksson to Karin Doris Ingeborg Nordin, and ultimately to NAS, confirming this direct ancestral connection through multiple generations.