Becky: Thanks for responding. First - this is a test on the Y chromosome. Only males have the Y chromosome. The DNA we are testing is passed down from father to son generation after generation virtually unchanged. If two Davenports are tested and they match -- then there is a good chance they have a common ancestor. Does your grandmother have brothers with male descendants? We are using FamilyTree DNA as the lab. There are two tests for the Y-DNA - a 12 marker and a 25 marker. I strongly suggest the 25 marker. It is much more useful for our purposes. Our group discount cost per test is $169 + $2 shipping = $171. Check out our website at <A HREF="http://www.DavenportDNA.com">http://www.DavenportDNA.com</A> for more information. If you are interested I will send you a link to get the discounted price. If you have any other questions you can contact me at [email protected] Bill Davenport [email protected]