The paternal relationship between John F York and his daughter
Lydia Ethel York is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant GT.
The segmental (via DNA segment triangulation) and total DNA shared between GT and other confirmed descendants of
David York is consistent with the expected ranges for their respective relationships. Since GT descends from David York through John F York and his daughter Lydia Ethel York, the presence of significant shared DNA between GT and other known descendants of David York validates the generational links along this paternal line.
This supports the conclusion that DNA was passed from MRCA David York through John F York to Lydia Ethel York, and ultimately to GT, confirming this direct ancestral connection through multiple generations.