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Some of your 4th cousin matches are not actually 4th cousins A higher number of shared centimorgans between 4th cousins could be indicative of endogamy, meaning marriages between cousins, etc.) The range of shared DNA between fourth cousins can range from 0-125 cMs (the exact range is up for debate, since some experts say that upper limit is around 125 cMs, and others say that the higher end of the range is much lower, at about 40 cMs.Of those fourth cousins with whom you do share DNA, you will share an average of about 13 cMs ( centimorgans).You will only share DNA with about half of your 4th cousins.
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Since your fourth cousins are not very closely related, there are some important things you need to know about your DNA relationship: Yikes! That would be a lot of birthday presents – maybe it is better that we lose track of each other ? How much DNA should you share with a 4th cousin? It seems shocking to imagine that all of my second cousins and I might eventually have over 200 descendants – contributing our share of the total of 900-1500 fourth cousins to our grandchildren. In other words, it is definitely possible for distant cousins to know each other growing up, but it is unusual and it takes a lot of effort these days when people live so far away from each other. I’m the oldest great-grandchild on this side of the family, so most of my second cousins don’t have children yet, but I can imagine a day when our children know each other (they would be third cousins) – and maybe even a day when a few of our grandchildren know each other – fourth cousins! My grandmother on my dad’s side and her siblings have made a concerted effort to keep our family “together”, even though we live spread out all over the whole country.Ī number of our extended family members get together occasionally for a great-uncle’s birthday, or a second cousin’s wedding. This whole conversation about 4th cousins has got me thinking about my own family.
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Obviously, the exact number of fourth cousins that you actually have depends on how many children your great-great-great grandparents had, how many children their children had, and so-on and so-on.Įven with the average family having 2-3 children per generation, the family will grow exponentially, creating a surprising number of descendants fairly quickly. The average person could have between about 900-1500 fourth cousins. This means that you can have an awful lot of fourth cousins out there somewhere, and it’s unlikely that you know any of them – most people don’t grow up knowing any fourth cousins personally. Some of your 4th cousin DNA matches are actually 4th cousinsĪs you already know, a 4th cousin shares great-great-great grandparents with you. They could be much closer, or much more distant than an actual fourth cousin.
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You might have noticed that Ancestry DNA has grouped your DNA matches into various categories, ranging from Immediate Family, to 4th Cousin, to Distant Cousin.Īs it turns out, Ancestry DNA is only able to estimate your relationship to your DNA match, based on the amount of shared DNA and the number of shared DNA segments.įor this reason, people who are in the 4th cousin category on Ancestry might not actually be fourth cousins.