Can someone please explain to me how cousins work? First, second, third cousins? Removed cousins? Twice removed cousins?

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I tried to Google it but it got VERY confusing very fast, if anyone could dumb it down for me that would be great lol

In: Biology

8 Answers

Anonymous 0 Comments

Cousins first – we’ll get to the “removed” part in a bit.

Cousins are easy. Count how far back your most recent common ancestor is. Parents = siblings, grandparents = 1st cousins, great grandparents = 2nd cousins, great-great grandparents = 3rd cousins. If you and your cousin are different generations (i.e. your grandfather is their great grandfather), count from whomever is the closest in that case (so in the previous example, they’d be your first cousin because it’s your grandfather, not second cousin because he’s their great grandfather).

Removed is also fairly straightforward. Once you have identified your common ancestor, count how many generations apart you and they are. (Parent = 1, grandparent = 2, and so on). Also count the distance from your cousin to their ancestor. The difference between those two numbers is the difference in your degree of removal.

Here’s a chart:

Generation Count | Ancestor | – | – | –
—————-|——–|-|-|-
3 | Great Grandparent | – | – | Great Grand Uncle
2 | Grandparent | | Grand Uncle | 1st cousin twice removed
1 | Parent | Uncle | 1st cousin once removed | 2nd cousin once removed
0 | **You** | 1st cousin | 2nd cousin | 3rd cousin
1 | Child | 1st cousin once removed | 2nd cousin once removed | 3rd cousin once removed
2 | Grandchild | 1st cousin twice removed | 2nd cousin twice removed | 3rd cousin twice removed
3 | Great Grandchild | 1st cousin 3 times removed | 2nd cousin 3 times removed | 3rd cousin 3 times removed

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