The maternal relationship between Mary Ibia Robinson and her DNA tested daughter AT is confirmed by the direct inheritance path of autosomal DNA.
The segmental (via DNA segment triangulation) and total DNA shared between AT and other confirmed descendants of
Preston S. Robinson/
Jane H. Jackson is consistent with the expected ranges for their respective relationships. Since AT descends from Preston S. Robinson/Jane H. Jackson through Mary Ibia Robinson, the presence of significant shared DNA between AT and other known descendants of Preston S. Robinson/Jane H. Jackson validates the generational links along this maternal line.
This supports the conclusion that DNA was passed from MRCA couple Preston S. Robinson/Jane H. Jackson through Mary Ibia Robinson to AT, confirming this direct ancestral connection through multiple generations.