The maternal relationship between Ellen Nellie Casey and her daughter Kathleen Ellen Richardson is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant KMC.

The segmental (via DNA segment triangulation) and total DNA shared between KMC and other confirmed descendants of Daniel Casey/Margaret Donahue is consistent with the expected ranges for their respective relationships. Since KMC descends from Daniel Casey/Margaret Donahue through Ellen Nellie Casey and her daughter Kathleen Ellen Richardson, the presence of significant shared DNA between KMC and other known descendants of Daniel Casey/Margaret Donahue validates the generational links along this maternal line.

This supports the conclusion that DNA was passed from MRCA couple Daniel Casey/Margaret Donahue through Ellen Nellie Casey to Kathleen Ellen Richardson, and ultimately to KMC, confirming this direct ancestral connection through multiple generations.