The paternal relationship between Matthias Justin and his son Mathias Joseph Justin is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant GJ.

The segmental (via DNA segment triangulation) and total DNA shared between GJ and other confirmed descendants of Johann Baptist Fessler/Elisabetha Maria Schmitz is consistent with the expected ranges for their respective relationships. Since GJ descends from Johann Baptist Fessler/Elisabetha Maria Schmitz through Matthias Justin and his son Mathias Joseph Justin, the presence of significant shared DNA between GJ and other known descendants of Johann Baptist Fessler/Elisabetha Maria Schmitz validates the generational links along this paternal line.

This supports the conclusion that DNA was passed from MRCA couple Johann Baptist Fessler/Elisabetha Maria Schmitz through Matthias Justin to Mathias Joseph Justin, and ultimately to GJ, confirming this direct ancestral connection through multiple generations.