Any male named O'Dair,O'Daire,ODare,ODear or any of its variants, is encouraged to participate in this study. To actually participate, you must be a male with the O'Dair (or variant) surname as the Y-chromosome necessary to perform this test is only present in the male and is passed directly from father to sons and grandsons. If you choose not to test, or you are ineligible, you may want to encourage or perhaps even sponsor a cousin or an uncle that does carry the surname. There are 3 types of tests we are using for the project -- the 12-marker (Y-12), the 37-marker (Y-37), and the 67-marker test (Y-67). The kit is mailed to your home. It is a cheek-swab kit. I am encouraging testing on the 37-marker or the 67-marker test as our families may have a common DNA pattern that does not enable us to see the distinctions between families when using the 12-marker test. Obviously, the 37-marker and the 67-marker tests are more expensive and if the cost keeps someone from testing, the 12-marker test is better than no test at all.