The maternal relationship between Ruth Katherine Cain and her son
Thomas Wendall Cotton is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant GFP.
The segmental (via DNA segment triangulation) and total DNA shared between GFP and other confirmed descendants of
Bernard "barney" R Cain is consistent with the expected ranges for their respective relationships. Since GFP descends from Bernard "barney" R Cain through Ruth Katherine Cain and her son Thomas Wendall Cotton, the presence of significant shared DNA between GFP and other known descendants of Bernard "barney" R Cain validates the generational links along this maternal line.
This supports the conclusion that DNA was passed from MRCA Bernard "barney" R Cain through Ruth Katherine Cain to Thomas Wendall Cotton, and ultimately to GFP, confirming this direct ancestral connection through multiple generations.