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
William Harvill/
Barbara Sally Ollis is consistent with the expected ranges for their respective relationships. Since KM descends from William Harvill/Barbara Sally Ollis through Preston Oral Harvill and his son DH, the presence of significant shared DNA between KM and other known descendants of William Harvill/Barbara Sally Ollis validates the generational links along this paternal line.
This supports the conclusion that DNA was passed from MRCA couple William Harvill/Barbara Sally Ollis through Preston Oral Harvill to DH, and ultimately to KM, confirming this direct ancestral connection through multiple generations.