The most conclusive way to determine if a woman is the biological mother is with Maternity testing. However, we know that may not be possible, so we suggest looking at other testing we offer to help you learn the truth through DNA.
One possibility is a maternal grandparent test is done with one or both of the suspected mother’s biological parents. Another option may be a maternal sibling DNA test, which is done with another child who may share the same mother.
If the possible mother has a full brother or sister, then an aunt or uncle DNA test (called an Avuncular test) can be done. And a final option may be a mtDNA mitochondrial test will conclusively determine whether those participating share the same female genetic line.