The paternal relationship between Michael OSullivan and his daughter Ellen OSullivan is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant JL.

The segmental (via DNA segment triangulation) and total DNA shared between JL and other confirmed descendants of John Sheehy is consistent with the expected ranges for their respective relationships. Since JL descends from John Sheehy through Michael OSullivan and his daughter Ellen OSullivan, the presence of significant shared DNA between JL and other known descendants of John Sheehy validates the generational links along this paternal line.

This supports the conclusion that DNA was passed from MRCA John Sheehy through Michael OSullivan to Ellen OSullivan, and ultimately to JL, confirming this direct ancestral connection through multiple generations.