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Posted by GFA Terry <GFATerry@aol.com> on Tue, 19 Nov 2002, in response to Anyone know what this relationship is?, posted by mmaruca on Fri, 15 Nov 2002Hello, I'd be glad to explain. When two people share the same parent, they are brothers and sisters.
When two people share the same grandparent, but do not have the same parent, then they are first cousins.
When two people share the same great grandparent, but do not have the same grandparent or parent, they are second cousins. And so on.
Here's how "removed" fits in --
When two people have a common ancestor, they are cousins of some kind. If they do not descend evenly from their common ancestor, then they will have a "removed" relationship. Here's an example: let's say the common ancestor is the great grandparent of one of them and that same ancestor is only the grandparent of the other one. This means that they do not descend evenly from that person.
To figure out the relationship, you take the closest one to the ancestor, the grandparent, and that makes it a "first cousin" relationship. Next, you subtract the difference in the generations: great grandparent minus grandparent makes it one generation difference. This means that you are once removed.
Put both together and you have first cousins once removed (for someone whose grandparent is the great grandparent of the other person).
GFA Terry, Golden Gate Genealogy Forum
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