Tim - Thanks, as always, for your thoughtful, informative responses. I'd like to ask a couple of questions for my own benefit, and I'll assume others may also benefit from this (including Bob, whose thread this is!) 1. I know that segment start and stop points are approximations. But does the fact that the two segments have the exact same reported start and stop points, cM, and SNPs, add to the likelihood they are the same DNA segment? 2. As to the question of whether these are on the same or opposite sides of Ch 3, am I right that Gedmatch cannot answer that question directly? But that you might see in the data for the four people other evidence (a large number of smaller shared segments, for example) that might point to them all being related, or (in the absence of such supporting indications) not? Thanks! Dwight On Wed, Dec 18, 2013 at 12:48 PM, Tim Janzen <tjanzen@comcast.net> wrote: > Dear Bob, > I suggest you be cautious about this situation. There are a number > of possible explanations for this situation including the following: > 1. It is possible that there are one or more genotyping errors that are > preventing you from all matching each other at FTDNA. > 2. It is possible that the 20 cM threshold for displaying a match isn't > being met by several of the people. > 3. It is possible that persons B and C are matching each other on the > opposite chromosome than person A is matching you on. > > You could have all of these people upload their data files to > GEDmatch and review the data there or you could ask them to send you their > raw data files so you can sort this all out from the raw data yourself. > Sincerely, > Tim Janzen > > -----Original Message----- > From: autosomal-dna-bounces@rootsweb.com > [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of R&J Dickinson > Sent: Wednesday, December 18, 2013 9:16 AM > To: AUTOSOMAL-DNA@rootsweb.com > Subject: [AUTOSOMAL-DNA] Family Tree DNA matches > > > However, FTDNA does not report that I match either person B, my cousin, or > person C and does not report that person B matches person A. If all four > of > us match at the exact same place on Chromosome 3, is there a valid reason > that FTDNA does not show all of us as matches? > > > Is it reasonable to conclude that the four of us are likely to have a > common > ancestor? > > > Bob Dickinson > > > > > ______________________________ > For answers to Frequently Asked Questions about mailing lists, please see: > http://dgmweb.net/MailingListFAQs.html > > > ------------------------------- > To unsubscribe from the list, please send an email to > AUTOSOMAL-DNA-request@rootsweb.com with the word 'unsubscribe' without > the quotes in the subject and the body of the message >