Carrie wrote: > I have a question about DNA research for women. I have an adopted > aunt, who as the story goes, is actually my sister. Would DNA > testing prove whether or not we share the same father? And would it > show if her father is actually my grandfather(another version of the > story)? We know that she is the daughter of one of these two men > (my father or grandfather), but don't know which. Would DNA testing > of myself and my aunt answer these questions? The type of testing that is now commercially available for genealogy would not help you at all, but there are lots of labs that specialize in paternity testing. This sort of testing would require more than just you and your "aunt" to participate, though. It works best if you can compare samples from the child and both putative parents. If you can't get a sample from your father, you would need samples from your mother, the mother of your aunt, and several of your siblings (or you could go at it from the other direction and get samples from your aunt's mother and several of your grandfather's children, as well as the mother of those children if different). John Chandler "John F. Chandler" <JCHBN@CUVMB.CC.COLUMBIA.EDU>