The maternal relationship between Eunice Eleanor Curran Carmody(Twin) and her daughter ECCH is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant SL.
The segmental (via DNA segment triangulation) and total DNA shared between SL and other confirmed descendants of
John Edwin Curran/
Margaret Elizabeth Tierney is consistent with the expected ranges for their respective relationships. Since SL descends from John Edwin Curran/Margaret Elizabeth Tierney through Eunice Eleanor Curran Carmody(Twin) and her daughter ECCH, the presence of significant shared DNA between SL and other known descendants of John Edwin Curran/Margaret Elizabeth Tierney validates the generational links along this maternal line.
This supports the conclusion that DNA was passed from MRCA couple John Edwin Curran/Margaret Elizabeth Tierney through Eunice Eleanor Curran Carmody(Twin) to ECCH, and ultimately to SL, confirming this direct ancestral connection through multiple generations.