> From: CeCe Moore > Sent: Saturday, February 11, 2012 3:58 AM > > Yes, Diana, you are right to wonder, but it can happen. Even with a > 3rd cousin 10 percent will not show a match. Since you are one > generation closer to the other cousins, it makes sense that you > match them, especially since the difference between them is on the > border of where autosomal inheritance falls off dramatically > (between 3rd and 4th cousin). The fact that no match shows at all > between any of the comparisons with this particular "cousin" is a > little suspect, but you are lucky that the others all do match > because a pair of full 4th cousins has only about a 50 percent > chance of matching. That's the rub. If the chance of a 4th cousin matching is 50%, then the chance that three would not match is getting close to being a probable non-match. One answer, of course, would be to test more cousins, and I've put another offer out, both for another THOMPSON and another DAVIS. > If you feel comfortable with Gedmatch, I would > upload everyone there and see if there are a number of matching > segments under FF's threshold, especially overlapping ones among you > all. I'm comfortable with GEDmatch, but I'm reluctant to ask three complete strangers to allow me to upload their results to a public database. I probably won't ask. > If not, I would start wondering about the possibility of a NPE > on their line that intersects with yours. That is what I'm wondering. I need to find a second DAVIS cousin to Y-DNA test and FF test. And I need to push the rest of my THOMPSON and DAVIS cousins to be tested - this time at *their* expense! Thanks for the input, Cece. Diana