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What's a Second Cousin Once Removed?

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Let's start with the basics.

This is Bob.

We'll use him to show different relationships with his family.

Bob's immediate family consists of his brother, his sister, and his parents.

We can make this a whole lot simpler by just showing one of Bob's parents.

This now represents Bob's mom or dad.

We'll do the same thing for his siblings.

At some point, Bob's sibling may decide to have a child of their own.

This person would be Bob's nibbling.

...or more commonly known as niece or nephew.

At some point Bob's niece or nephew may also have a child.

This person would be Bob's grand niece or nephew.

...and the next generation would be great grand.

With each generation after this you just add another "great" on it.

Now let's expand this above and little bit.

Bob's parent also has a parent which would be Bob's grandparent.

The have another child beside's Bob's parent:

This is Bob's aunt or uncle.

Any child here is Bob's first cousin - you and I might just say cousin.

Notice that first cousins share the same grandparents.

In other words cousins are children of siblings.