Ancestor Search ...Find your Ancestors

Cousin Calculator, Relationship Chart
& Relationship Definitions

Use these date, money, relationship, and surname calculators to help build your family history.

Discover your family's story.

Enter a grandparent's name to get started.

Start Now

Genealogy Calculators:
Cousin Calculator

Inflation Calculator

Metaphone Calculator Roman Numeral Converter Soundex Converter More Calculators  

Use the cousin calculator to determine the family relationship between two people who share a common blood ancestor. Note: Relationship Chart will appear in a new browser. You may have to over-ride your pop-up stopper for it to appear.

Cousin Terms and Definitions

First Cousin
Your first cousin is a child of your aunt or uncle. While you share one set of grandparents with your first cousin, you do not have the same parents.

Second Cousin
Your second cousin is the grandchild of your great-aunt or great-uncle. While you share one set of great-grandparents with your second cousin, you do not have the same grandparents.

Third Cousin
Your third cousin is the great-grandchild of your great-great-aunt or great-great-uncle. While you share one set of great-great-grandparents with your third cousin, you do not have the same great-grandparents. Fourth cousins have one set of great-great-great-grandparents, but not the same great-great-grandparents. And so on.

Fourth Cousin
Fourth cousins share one set of great-great-great-grandparents, but do not have the same great-great-grandparents. This continues on with fifth cousins and so forth.

Double Cousins
If two siblings in one family marry two siblings from another family and each couple has a child, the children are double first cousins. The word double means they share the same four grandparents. Regular first cousins share only one set of common grandparents, while double first cousins share both sets of grandparents plus all lineal and collateral relatives.

The relationships of cousins of different generations are explained by using the word "removed". Cousins who are "once removed" have a one-generation difference. For example, the first cousin of your father is your first cousin, once removed or one-time removed. In that case, your father's first cousin is one generation younger than your grandparents and you are two generations younger than your grandparents. Likewise, your first cousin's child is also a first cousin, once removed. This one-generation difference is explained by saying that your are cousins "once removed."

Twice removed or two-timed removed means that there is a two-generation difference between cousins. If you are two generations younger than the first cousin of your grandparent, then the relationship between you and your grandparent's first cousin are first cousins, twice removed.

Cousin relationships can be any combination of first, second, third and so on, with once removed, twice removed, and so on. A genealogy program will calculate exact family relationships in your family tree for both blood relatives and relatives by marriage. Here is a list of genealogy programs many of which are free.

By using the cousin calculator above, you can see how the "removed" relationship works for cousins by blood. Use the + and - buttons to change generations between blood cousins to see how cousin relationships are defined.

For example:
"If you are the "grandchild" of an ancestor and
Your relative is the "great-grandchild" of same ancestor,
then you and your relative are "1st cousins 1 time removed"

More family relationship definitions

Calculator from the Mother of all Cousin Calculators

Start Your Family Tree.

Enter your name to discover your family's story.

Start Now

Free at

      It's Easy to Get Started!

  •   Build your family tree online for FREE! will use what you enter to find more about your family's ancestors.

  •   Free Ancestry Databases
    Free databases listed by location and popularity.

  • Site Features

  •   Genealogy Records Search
    Search for your ancestors by record type.

  •   Search by Location
    Search for your ancestors by country.

  •   Free Genealogy
    Free genealogy resources: charts, lessons, software, databases, look ups, relationship charts, form letters, translation services.

  • Coupons & Deals
    Special offers, coupons, coupon codes, discounts, sales & deals

  •   FTM 2014
    Family Tree Maker 2014 list of improvements

  •   Mormon Genealogy
    Find your family in the free online databases of digitized original world-wide records.

  • Contact Us | Privacy Policy | Site Map
    © 1997 - 2013  SearchforAncestors.Com   All rights reserved.