The paternal relationship between Johann Dueck and his daughter
Katharina Dueck is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant DD.
The segmental (via DNA segment triangulation) and total DNA shared between DD and other confirmed descendants of
Johann Sawatzky/
Susanna "sanke" Entz is consistent with the expected ranges for their respective relationships. Since DD descends from Johann Sawatzky/Susanna "sanke" Entz through Johann Dueck and his daughter Katharina Dueck, the presence of significant shared DNA between DD and other known descendants of Johann Sawatzky/Susanna "sanke" Entz validates the generational links along this paternal line.
This supports the conclusion that DNA was passed from MRCA couple Johann Sawatzky/Susanna "sanke" Entz through Johann Dueck to Katharina Dueck, and ultimately to DD, confirming this direct ancestral connection through multiple generations.