My purpose in participating in AncestryDNA is largely to identitfy the birth family of my great grandmother (my mother's father's mother), who was adopted circa 1917 in MS. To that end, I purchased a DNA kit for myself, my mom, and my 2nd cousin 1x removed, who is the granddaughter of my great grandmother. For the past several months I've been combing through our matches looking for an overlap in common ancestors unaccounted for by my great grandfather's family. Last week I was fortunate enough to get a 3rd cousin match to someone whose ancestors are the Hagler family of AL. The name sounded familiar so I went back to my cousin's matches, and there it was: 4th cousin match with common Hagler ancestors. In that same tree (hers), the Haglers had married the descendents of Prescott Bush. Not of the political family, but the guy from SC who moved to Webster County, GA. My cousin has two more matches to the descendants of Bush, independent of her Hagler-Bush match. So I went back though my matches, and I've got two 4th cousin matches to Bush descendants as well. Since my cousin's only genetic connection to me is through her grandparents (my great grandparents), these findings seem to indicate that my adopted great grandmother is a descendant of both John P. Hagler of Barbour Co AL and of Prescott Bush of Webster Co GA. That's a terrific hint, especially considering that there are only so many places the two families could have intermarried, and one is already in the tree of my cousin's match. The probelm is that my mother doesn't match either a) the specific individuals that I and my cousin match or b) persons with these families clearly presented in their trees. That could be because I haven't found them yet, something is wrong with the matching algorithm, or, as others have suggested, the match is through my biological father's side. The later alternative seems impossible to me, because there is no known genealogical relationship between my paternal line and my cousin's family. There isn't even any historical geographic overlap between the families in question. Soon I'm going to purchase a kit for another cousin, also the grandchild of my great grandmother. His father's father parents were recent immigrants of Italian origin. Should he match, it would be enough to put away my doubt. Until then, I guess my question is, is it still possible for this to be a valid matralineal match while my mother doesn't appear in the match list? I myself don't match most of the people on her list, but Ancestry has assigned us a "Parent/Child" degree of relatedness. I've got the hospital photos to prove it.