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What is a Sixth Cousin?

Do you want to learn about sixth cousins? In this article, find out what a sixth cousin is, how they are related, how many you have, and more!

Cousin relationships can be confusing and hard to keep track of, and sixth cousins are no exception. In fact, they might even be more confusing than other types of cousins because they are more distantly related to us.

What is a Sixth Cousin?

It is unlikely that you grew up having a family relationship with any of your sixth cousins. However, if your ancestors have lived in the same geographic area for many generations, you might have met a sixth cousin while walking down the street and have not even known it.

In fact, you might be friends with a sixth cousin without even knowing that you share a branch of your family tree.

Most people become curious about these more distant cousins through family tree research, or even DNA testing. DNA results often come with a list of genetic relatives, and we might discover that some of these relatives are sixth cousins.

What is the definition of a sixth cousin?

Sixth cousins share great-great-great-great-great grandparents, and are descended from different children of those ancestors. Another way to put it is that your great-great-great-great grandparent and the great-great-great-great grandparent of your sixth cousin were siblings.

Sixth cousin is often written as “6th cousin”, or abbreviated like this:


If you and your cousin are both descended from the same child of those 5th great-grandparents, then you might be fifth cousins instead of sixth cousins.

Are sixth cousins distant cousins?

Sixth cousins are distant cousins. In fact, most people would agree that sixth cousins are even very distantly related cousins.

The main reason that we call sixth (6th) cousins distant relatives is because of the sheer number of sixth cousins that we likely have and the degree of separation between us. Since we have 128 great-great-great-great-great grandparents (the common ancestor shared with 6th cousins), sixth cousins are simply less notable in our family tree.

Most people have a sizeable number of first, second, and third cousins. These more closely related cousins are not considered to be distant cousins.

However, cousins who are related to each other at distances greater than third cousin, including 4th-6th cousins, are considered to be distant cousins.

How many degrees of separation are there between sixth cousins?

Sixth cousins are separated by 14 degrees consanguinity. We calculate this by counting up seven degrees to the most recent common ancestor (5th great-grandparents) and then down seven degrees to our sixth cousin, for a total of fourteen.

If you consider that parents are only one degree of separation from us, and first cousins are four degrees away, we can better understand why sixth cousins are considered to be very distant relations.

What is a sixth cousin once-removed?

A sixth cousin once-removed is the child of your sixth cousin, or the parent of your seventh cousin. The common ancestor shared between sixth cousins once-removed is still the 5th great-grandparents of the person who is in the generation most recently descended from the shared ancestor.

We often see sixth cousins once-removed abbreviated like this:


We say that a cousin is once-removed when they are not on the same generation as we are. In the case of 6th cousins, we would say one is once-removed when they are a generation away from us.

The children of sixth cousins are seventh cousins.

What is a half-sixth cousin?

While many sixth cousins share two 5th great-grandparents, some might share only one. We call a half-sixth cousin someone who shares only a single great-great-great-great-great grandparent with us.

Half-relationships are very common in cousins, since it was common historically, though less than it is now, for a person to be married more than once during the course of their life. If a person remarried, children born in the second marriage were half-siblings to those born in the first.

The great-great-great-great grandchildren of those half-siblings will be half-sixth cousins. Half-sixth cousins will share only one great-great-great-great-great grandparent, instead of the two ancestors that full sixth cousins share.

How many 6th cousins do I have?

While it may come as a shock, you could have as many as 17,300 sixth cousins. That’s enough 6th cousins to fill a sports arena!

If your family was particularly excellent at procreation and was touched by fortune and good circumstances, you might have even more. Of course, the exact number of sixth cousins that you have will depend on many factors.

Since the common ancestor shared with your 6th cousin is your 5th great-grandparent, you might have sixth cousins living in other states and countries. Anywhere where these ancestors left descendants is a place where you might find your sixth cousins

How to find your sixth cousins

The fastest way to locate sixth cousins, who can be very helpful as partners in genealogy research, is to take a DNA test. Ancestry DNA has the largest database of customers, and many of them are also interested in building their family trees and connecting with distant relatives.

Do you share DNA with sixth cousins?

While we might have tens of thousands of sixth cousins, we won’t share DNA with all of them. We might share DNA with less than 2% of our 6th cousins, which means that if 17,300 of our 6th cousins took a DNA test, we might show up as distant genetic matches to only about 346 of them.

Even so, a few hundred 6th cousins on a DNA match list is plenty for most of us to research and connect with.

Those 6th cousins who do share DNA with us will likely share only a small amount. For example, according to data collected for the Shared cM Project, most sixth cousins shared between 10-50 centimorgans (cM).

And yes, it’s okay to date a sixth cousin. Because 6th cousins are not closely related, there are no laws or customs anywhere in the world preventing relationships between cousins of this distance.

This question comes up a lot, believe it or not.


I hope that you have found all of the information about sixth cousins that you were looking for in this post. If you have any questions about something that you read here, or if you have ever met one of your sixth cousins in person, I would love for you to leave a comment in the discussion below.

Thanks for reading today!

Share the knowledge!

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Alan Rockey

Tuesday 27th of June 2023

Hi, very interesting article. I work with one of my sixth cousins.

Kayla myers

Saturday 10th of September 2022

So me and my bf just found out we was cousins (5th) cousins … and I don’t know what to do, his mom said that we were barely related and that we only share little dna but idk I need help

Joyce Allison

Tuesday 28th of June 2022

I have a Six cousin 5 times removed. What does 5 times removed Mean?

Joyce Allison

Tuesday 28th of June 2022

My 6th cousin is 5 times removed. What does 5 times removed mean? I would assume that means he is very distant, but I don’t know.


Sunday 24th of September 2023

@Joyce Allison, What I have found is, the once removed removed cousin is a child of the cousin

Sunny Snyder

Saturday 12th of March 2022

My family tree shows that I have a 6th cousin who is 24 years older than me. In fact, I graduated with her son. It seems strange because she is closer in age to my father. Can you help me understand?


Thursday 17th of March 2022

Hi Sunny, This is such a great question! The reason that there is such a big age difference between you and your 6th cousin can be traced to when your direct-line ancestors had children versus when your 6th cousin's direct-line ancestors had children. You probably won't need to go too far back in your respective family trees to find out exactly which line had their children earlier (or later), causing this age difference. This is a very common situation and can happen with closer or more distant cousins, too. Thank you so much for this question. Sincerely, Mercedes

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