Hi Tim and Jim Yes I think it is the best way forward. I have Dad's DNA but unfortunately not Mum's. I probably should ask one of my siblings to test too. Karen On Sun, Oct 20, 2013 at 4:06 PM, Tim Janzen <tjanzen@comcast.net> wrote: > Dear Karen, > I agree with Jim Barlett's comments on triangulation. I have one > other technique I find helpful, particularly for HIRs that are relatively > short (7-10 cMs) for which I have no other people matching one of my > parents > on the same segment. I also compare my two brothers and me against the > person in question in 23andMe, FF, or GEDmatch. If the person matches one > of my parents and also matches one of my brothers or me at the same > location > then the HIR is highly likely to be IBD. If it doesn't match one of my > brothers or me then the HIR is more likely to be IBS. There is only a > 12.5% > probability that any one DNA segment that my parents have will not have > been > inherited by one of my brothers or me. > Tim Janzen > > -----Original Message----- > From: autosomal-dna-bounces@rootsweb.com > [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Karen Hodges > Sent: Saturday, October 19, 2013 4:53 AM > To: autosomal-dna@rootsweb.com > Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of them > > Hi Jim > > Thanks for your comments. I think I am good with the true matches now but > the false positives can these only be determined by comparing the raw DNA > when no genealogy match is found and is there a program that can do this? > > Karen > > > On Sat, Oct 19, 2013 at 10:12 PM, Jim Bartlett > <jim4bartletts@verizon.net>wrote: > > > Karen > > > > In general I agree with Tim. I would add that Triangulation has a very > > specific requirement: A=B=C=A. That is each pair (AB,AC,BC) must have a > > shared segment (usually at least 7cM, but perhaps smaller with some risk > of > > a false positive); AND each of these shared segments are significantly > > overlapping - such that all three - ABC - have, say, at least the same > 7cM. > > > > ______________________________ > 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 >

Dear Karen, You should not only test "one" of your siblings, you should test all of your siblings if your mom is dead. You will never regret doing that. If you have 10 siblings, then you might want to test 4 or 5 to begin with since there will be diminishing returns the more siblings you test. Tim -----Original Message----- From: autosomal-dna-bounces@rootsweb.com [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Karen Hodges Sent: Saturday, October 19, 2013 10:29 PM To: autosomal-dna@rootsweb.com Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of them Hi Tim and Jim Yes I think it is the best way forward. I have Dad's DNA but unfortunately not Mum's. I probably should ask one of my siblings to test too. Karen