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Cousin Relationship Calculator

Calculate the family relationship between two people who share a common blood ancestor.

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Note: Relationship Chart will appear in a new browser. You may have to over-ride your pop-up stopper for it to appear. From the Mother of all Cousin Calculators




Cousin Terms and Definitions



Cousin (or First Cousin or Full Cousin)
The son or daughter of an uncle or aunt.

Second Cousin
People who have the same great-grandparents, but not the same grandparents. Second cousins are children of first cousins.

Third, Fourth, and Fifth Cousins
Third cousins have the same great-great-grandparents, but not the same great-grandparents or grandparents. Fourth cousins have the same great-great-great-grandparents, etc.

Removed
When the word "removed" is used to describe a relationship, it indicates that the two people are from different generations. 

The words "once removed" mean that there is a difference of one generation. For example, your father's first cousin is your first cousin, once removed. This is because your father's first cousin is one generation younger than your grandparents and you are two generations younger than your grandparents. This one-generation difference equals "once removed."  The one-generation difference has nothing to do with age, but rather with descendance from the same person.

Twice removed means that there is a two-generation difference. You are two generations younger than a first cousin of your grandmother, so you and your grandmother's first cousin are first cousins, twice removed.

Half Cousin
First cousins are the children of siblings; therefore, half first cousins would be the children of half siblings. Half-cousins would have one common grandparent instead of two common grandparents.

Cross Cousin
A cross cousin is from the parent's opposite-sexed sibling; for example, a cousin who is the child of one's mother's brother or  one's father's sister.

Parallel Cousin
A parallel cousin is from the parent's same-sexed sibling; for example, a cousin who is the child of one's mother's sister or one's father's brother.   Parallel cousins are the children of two brothers or two sisters.

Double Cousins
If two siblings in one family marry two siblings from another, and each couple has a child, these children are double cousins.  The addition of the word double to the first cousin term is the result of the number of common grandparents they have. Regular first cousins share only one set of common ancestors, while double first cousins share all lineal and collateral relatives.

Kissing Cousin
A distant relative known well enough to be kissed when greeted; or a cousin marriage

More Relationship Definitions




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