Hi Tim, seems you misunderstand my email. I wrote that A and B need to compare at GEDmatch (which is what your wrote as well). Person A is tested at AncestryDNA so your second statement (to compare them in Family Finder) is not possible for her (unless A decides to transfer to FTDNA but why pay if A can upload his data for free to GEDmatch?). Please don't answer emails which ask for a specific problem in a too broad way as it won't help Mardon in her specific case. There is already enough confusion as to what triangulation is, no need to introduce "essentially triangulation" to make it even harder. We had endless discussions about the general circumstances when triangulation is possible on FTDNA already, also no need to repeat those discussions tl;dr (in summary) Mardon, you need to convince A (the person who tested at Ancestry) to: 1) either upload his raw DNA data for free to GEDmatch, then perform the 1-to-1 between A and B to find out where they match 2) A needs to pay for the transfer to FTDNA and you then need to ask either A or B where they match each other on FTDNA to compare with where you daughter matches both of them Then and only then you have done triangulation (with either a positive or negative result) Andreas (WEST) born BASSO My ancestors: [http://www.wikitree.com/genealogy/Basso-Family- Tree-23](http://www.wikitree.com/genealogy/Basso-Family-Tree-23) "Tim Janzen via" <genealogy-dna@rootsweb.com> wrote: > Dear Mardon, > I disagree with Andreas about this. I believe that if you had a chance to > directly compare person A to person B (in GEDmatch or in Family Finder) that > there is well over a 99% probability that they would match each other. A > key fact here is that both of the HIRs are very long (each over 19 cMs and > each containing over 2900 SNPs). The probability that one of these HIRs is > IBS is thus very low. The fact that you don't match either person A or > person B is also key. The probability that errors in your raw data file are > causing person A or person B to not match you is very low. This means that > your spouse must have carried the DNA segment that your daughter shares with > person A and person B. Under the circumstances, this forms what is > essentially a triangulated group. You may not have determined that all > three people (person A, person B and your spouse) share the segment in the > traditional way (by direct comparison with each other), but in any case the > probability is extremely high that person A, person B, and your spouse > inherited this DNA segment from a shared ancestor. > Sincerely, > Tim Janzen > > -----Original Message----- > From: genealogy-dna-bounces@rootsweb.com > [mailto:genealogy-dna-bounces@rootsweb.com] On Behalf Of Andreas West via > Sent: Friday, January 8, 2016 7:28 PM > To: Mardon; genealogy-dna@rootsweb.com > Subject: Re: [DNA] Enough For Triangulation? > > No, it's not enough information. > > First of all if it can only be a paternal match as none matches you. > > But you need to compare each one, so you need all of them at Gedmatch. > > If A and B where both at FTDNA as well and you would know where they match > each other and your daughter than that could form a TG. > > So you need to convince B to upload to Gedmatch as well and then check if > and where he/she matches A > > Andreas