The paternal relationship between Thomas Irving Campbell and his son WHC is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant ES.

The segmental (via DNA segment triangulation) and total DNA shared between ES and other confirmed descendants of TC/Frances Sinclair is consistent with the expected ranges for their respective relationships. Since ES descends from TC/Frances Sinclair through Thomas Irving Campbell and his son WHC, the presence of significant shared DNA between ES and other known descendants of TC/Frances Sinclair validates the generational links along this paternal line.

This supports the conclusion that DNA was passed from MRCA couple TC/Frances Sinclair through Thomas Irving Campbell to WHC, and ultimately to ES, confirming this direct ancestral connection through multiple generations.