The maternal relationship between Ivy Louise Mixer and her daughter DEK is confirmed by the direct inheritance path of autosomal DNA down to their DNA tested descendant TDH.
The segmental (via DNA segment triangulation) and total DNA shared between TDH and other confirmed descendants of
Margaret Hartman is consistent with the expected ranges for their respective relationships. Since TDH descends from Margaret Hartman through Ivy Louise Mixer and her daughter DEK, the presence of significant shared DNA between TDH and other known descendants of Margaret Hartman validates the generational links along this maternal line.
This supports the conclusion that DNA was passed from MRCA Margaret Hartman through Ivy Louise Mixer to DEK, and ultimately to TDH, confirming this direct ancestral connection through multiple generations.