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I'm just wondering if some of you more experienced genealogists might be able to shed some light on these clusters of matches. I have several groups of Norwegian matches that are in the mid 20s to 30 cM range on my dad's side and then the same on my mom's side for what I believe is an Irish couple. The Norwegian is stressing me out because these a few Norwegian lines on my dad's side and outside of one (that has been documented incorrectly by A LOT of people) I can't figure out the connection.
Based on the trees I have looked at I can't identify the key ancestor for any of these, but I'm assuming that these are pretty distant matches (say 5-7 generations). I'm just wondering if there's anything scientific behind these big clumps staying connected to these larger groups whereas I have some documented 4th-5th cousins that only share about 15 cMs with. And then, if anyone has any tips on how to piece these large matches together. A few have some bigger trees and others have nothing at all.
I've looked at that silly cousin image that always gets posted, so I know that these aren't really close matches, but the clusters are interesting. Could these be kind of like endogamy in the Jewish world but just in these different populations?
I'm just wondering if some of you more experienced genealogists might be able to shed some light on these clusters of matches. I have several groups of Norwegian matches that are in the mid 20s to 30 cM range on my dad's side and then the same on my mom's side for what I believe is an Irish couple. The Norwegian is stressing me out because these a few Norwegian lines on my dad's side and outside of one (that has been documented incorrectly by A LOT of people) I can't figure out the connection.
Based on the trees I have looked at I can't identify the key ancestor for any of these, but I'm assuming that these are pretty distant matches (say 5-7 generations). I'm just wondering if there's anything scientific behind these big clumps staying connected to these larger groups whereas I have some documented 4th-5th cousins that only share about 15 cMs with. And then, if anyone has any tips on how to piece these large matches together. A few have some bigger trees and others have nothing at all.
I've looked at that silly cousin image that always gets posted, so I know that these aren't really close matches, but the clusters are interesting. Could these be kind of like endogamy in the Jewish world but just in these different populations?
It could be endogamy, it could also be a "pile-up" region on the chromes where long cM matches are frequent and not normally Identical by descent (IBD.) If you search "pile up regions on chromosomes" in Google, you can find these locations and double check that you don't match these people in one of those regions.
I'm just wondering if some of you more experienced genealogists might be able to shed some light on these clusters of matches. I have several groups of Norwegian matches that are in the mid 20s to 30 cM range on my dad's side and then the same on my mom's side for what I believe is an Irish couple. The Norwegian is stressing me out because these a few Norwegian lines on my dad's side and outside of one (that has been documented incorrectly by A LOT of people) I can't figure out the connection.
Based on the trees I have looked at I can't identify the key ancestor for any of these, but I'm assuming that these are pretty distant matches (say 5-7 generations). I'm just wondering if there's anything scientific behind these big clumps staying connected to these larger groups whereas I have some documented 4th-5th cousins that only share about 15 cMs with. And then, if anyone has any tips on how to piece these large matches together. A few have some bigger trees and others have nothing at all.
I've looked at that silly cousin image that always gets posted, so I know that these aren't really close matches, but the clusters are interesting. Could these be kind of like endogamy in the Jewish world but just in these different populations?
In addition to the great advice westsideboy gave; it may also be the amount of DNA that got passed down.
I have a match on Ancestry who's showing as a 5th to 8th cousin to me at 11cM. I'm thankful to have a lot of kits that I manage and very decent matches where I know we're all related via great grandparents. My distant match shows as a 2nd to 3rd cousin to 2 of them and to my 1st cousin, the match is showing as 4th to 6th
Thanks y'all. I forgot about pile-ups. I think that's where most of my Jewish matches are coming from, but I just wanted to confirm that this is a possibility within the other ethnicities. I find it odd that there's so many pile-ups in the Irish side since it's literally just one couple (going back to my great-grandfather). The Norwegians are heavy as Ancestry has me at 40% Norwegian and my father at 47% Norwegian.
And you mean they are shared matches with each other? Without a chromosome browser there's no way to know if they are matching on "pile-up regions."
Yeah, Ancestry's lack of a chromosome browser is very frustrating. You would have to download to GEDmatch (or another service) and hope those matches have downloaded there too.
I have some groups of matches like this in Ancestry also, they match one another and almost nobody else. It does seem to suggest they probably all match on the same segment. One group I assume is all matching me on a long segment on chr. 7, because several are found in GEDmatch and other sites, and we all share a surname in our trees (those who have trees) so must trace back to a common ancestor with that name who is unknown due to a lack of records before 1800. We are probably around 6th cousins, and the segment is long, over 40 cM in some cases.
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