Ed, FTDNA as noted is the largest DNA testing company. If you're trying to test males, FTDNA has surname projects which give a lower price for the testing. I should mention that some men with different surnames can match but there may not be a paper trail to back up the connection. My paternal grandparents were cousins with the same surname and my grandmother's brother had a son who had a son. I had my brother and grandmother's brother's grandson tested to see if I could find how close was my grandparents' relationship. Out of 67 markers tested, my brother and cousin matched 65 out of 67 markers. What does that mean? My brother and cousin matched 24 out of 25. However, another man (as noted below) matched my brother 25 out of 25 markers. However, that same man (Greaves) was 64 out 67 matches. In other words, the more markers that are tested (up to 67 at least) the more you can be sure of a connection. In comparing 25 markers, the probability that John J. Hopkins and James F. Hopkins shared a common ancestor within the last... 4 generations is 27.24% 8 generations is 57.78% 12 generations is 77.85% 16 generations is 89.03% 20 generations is 94.77% 24 generations is 97.57% In comparing 25 markers, the probability that John J. Hopkins and Robert A. Greaves shared a common ancestor within the last... 4 generations is 61.17% 8 generations is 84.92% 12 generations is 94.15% 16 generations is 97.73% 20 generations is 99.12% 24 generations is 99.66% There are other reasons why my brother and cousin are not a perfect match but I won't go into that now. Here's FTDNA website that you can pursue: _http://www.familytreedna.com/default.aspx_ (http://www.familytreedna.com/default.aspx) ? It will tell you the costs. Check out the surname projects to compare prices. Nora Hopkins FitzGerald Hopkins - Castlebar, Co. Mayo/New York City Grant - Drumboniff, Co. Down/NYC In a message dated 10/19/2008 3:03:38 A.M. Eastern Daylight Time, [email protected] writes: I read an article in AARP about DNA testing that will show if a person has a common ancestor with another...supposedly to show at least they are realated. Anyone know of a good site to go to and possible costs? ed **************New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out (http://local.mapquest.com/?ncid=emlcntnew00000002)