Do we have any information about *proven* MRCAs of a certain size/distance? By which I mean, has anyone ever *definitely* traced a (say, 20-cM) HIR to an MRCA of (say) 7C0R? ... which would require literally "walking it back," ... ... i.e. not "oh, well, she and I share 9g-grandparents, so ..." (because many of us with similar ancestry share lots of 9g-grandparents (I have one "DNA cousin" with whom I've identified NINE pairs of shared 8g- ad 9g-grandparents--and those are only the ones we "know" about), but that doesn't disprove the possibility of a more-recent connection we haven't identified). The furthest I've *definitely* walked back a connection (i.e. *every generation!*) is 5C0R. > -----Original Message----- > From: GENEALOGY-DNA [mailto:[email protected]] On > Behalf Of Tim Janzen > Sent: September 30, 2017 15.01 > To: [email protected] > Subject: Re: [DNA] Endogamy does exist in USA data > > My point was that it is impossible to accurately predict the genealogical > relationship for someone who shares between say 5 cMs and say 50 cMs with > you based solely on a one-to-one comparison. Those genealogical > connections could be as far back as 20th cousins or even further back. We

Eric, I have one Triangulated Group [18H36] with an uncle, two 4C, an 8C and two 9C - all on the same line. However, there is also a 5C1R and an 8C1R on a different line, so I won't be comfortable until I get some more intermediate cousins on this TG. On TG [14G25] I have a 2C1R, a 5C, a 6C and a 7C all on the same line (still searching for a 3C or 4C). On [11L25] I have a 2C1R; a 3C1R, a 5C and a 7C all on the same line. On 07L24] Half 1C; 5C, 6C, 7C1R on one line. On [06E24] Half 1C; 2C; 4C1R, 5C one line. [06C24] is strange and exciting. It has a 2C, and four Matches (widely separarted from each other) who are about 5C or 6C with each other, on a surname not in my Tree - perhaps their Common Ancestor is on the other side of my brick wall (I can always hope...) My best one: [04P36] with: 4C1R, 5C, 5C1R, two 6C1R, two 7C, 7C1R, and SIX 8C. Several of these entries represent 2 or 3 close relatives in one family, counted only once. Each of these are on one of the 3 generations of HIGGINBOTHAMs in my Tree. This started a year or so ago when I noticed a lot of Matches with HIGGINBOTHAM ancestry at AncestryDNA - so I searched on that surname and got over 100 hits (some fell out as not my line). I messaged all my cousins, and promised if they would upload to GEDmatch, I'd report back on the DNA analysis. Many did, and many of those are on this TG and a smaller number on two other other TGs - we all descend from 3 sons of the Patriarch, and most of them are closer cousins to each other (which they had not known about in most cases). This particular family generally had double digit children for several generations. I make no "proof" claims - there can be a bazillion follow up questions and maybe 2 bazillion reasons why any one of these might not be the correct genetic ancestral line. To me they all represent true DNA data, evidence, clues, etc., in my spreadsheet. Several years ago, I could keep up with the influx of data - now I am almost hopelessly behind. The data is out there.... We need automated ways to feed in the DNA data and GEDcoms and get the TGs grouped and the CAs for each TG. At that point a genealogist has to step in and do some analysis and make some judgement calls. Jim Bartlett [email protected] -----Original Message----- From: Eric S Johnson <[email protected]> To: genealogy-dna <[email protected]> Sent: Sat, Sep 30, 2017 6:22 am Subject: Re: [DNA] Endogamy does exist in USA data Do we have any information about *proven* MRCAs of a certain size/distance? By which I mean, has anyone ever *definitely* traced a (say, 20-cM) HIR to an MRCA of (say) 7C0R? ... which would require literally "walking it back," ... ... i.e. not "oh, well, she and I share 9g-grandparents, so ..." (because many of us with similar ancestry share lots of 9g-grandparents (I have one "DNA cousin" with whom I've identified NINE pairs of shared 8g- ad 9g-grandparents--and those are only the ones we "know" about), but that doesn't disprove the possibility of a more-recent connection we haven't identified). The furthest I've *definitely* walked back a connection (i.e. *every generation!*) is 5C0R.