The paternal relationship between Herbert Drefs and his DNA tested son FD is confirmed by the direct inheritance path of autosomal DNA.
The segmental (via DNA segment triangulation) and total DNA shared between FD and other confirmed descendants of
Wilhelmine Ernestine Grade is consistent with the expected ranges for their respective relationships. Since FD descends from Wilhelmine Ernestine Grade through Herbert Drefs, the presence of significant shared DNA between FD and other known descendants of Wilhelmine Ernestine Grade validates the generational links along this paternal line.
This supports the conclusion that DNA was passed from MRCA Wilhelmine Ernestine Grade through Herbert Drefs to FD, confirming this direct ancestral connection through multiple generations.