The paternal relationship between Preston Oral Harvill and his son DH is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant KM.

The segmental (via DNA segment triangulation) and total DNA shared between KM and other confirmed descendants of Leonard Washington Harvill/Maude Margaret Johnson is consistent with the expected ranges for their respective relationships. Since KM descends from Leonard Washington Harvill/Maude Margaret Johnson through Preston Oral Harvill and his son DH, the presence of significant shared DNA between KM and other known descendants of Leonard Washington Harvill/Maude Margaret Johnson validates the generational links along this paternal line.

This supports the conclusion that DNA was passed from MRCA couple Leonard Washington Harvill/Maude Margaret Johnson through Preston Oral Harvill to DH, and ultimately to KM, confirming this direct ancestral connection through multiple generations.