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This can be demonstrated with an example. Suppose Relative A was the great great great grandchild of the common ancestor. Go across the first row until you get to the “3rd Great Grandchild”. You can see that Relative A is the 6th generation of the common ancestor.

family tree relationship chart
The 3rd great grandchild is in the sixth column.

Now suppose Relative B was the great grandchild of the common ancestor. Going down the first column, this would make Relative B the 4th generation of the common ancestor.

The point where the row and column cross determines the relationship between Relative A and Relative B. In this case, the two relatives are second cousins twice removed (because it is the point where the 6th column and the 4th row cross).

It can take a while to get use to this process. However, the advantage is that this methodology can be used to find the relationship between any two people in a family tree. To make the process easier, we have provided a convenient pdf version of the Family Tree Relationship Chart that you can print out and keep for your records. With a bit of practise, the process becomes fairly straightforward for even relatively convoluted cases.

 

Some Additional Terms

Here are some additional terms that do not appear on the Family Tree Relationship Chart:

Paternal Cousin: A cousin from the father’s side of the family.

Maternal Cousin: A cousin from the mother’s side of the family.

Double Cousin: Cousins that are related on both the paternal side and the maternal side of the family. This could occur, for example, if two sisters in one family married two brothers from another family. Their offspring would be double cousins.

Ortho-Cousin: The children of two brothers or two sisters.

Cross-Cousin: The children of a brother and a sister.

Step Mother/Father/Brother/Sister: There are essentially two kinds of relationships: blood relationships and relationships based on marriage. The Family Tree Relationship Chart is based on blood relationships. Relationships based on marriage are called step relationships. Step relationships follow the same naming pattern and methodology as blood relationships. Thus, there is a step-mother, a step-father, a step-brother and a step-sister. The only difference in naming patterns for step relationships is that they rarely go beyond the cousin level.

Half Cousin: When step brothers or step sisters have children, their offspring refer to each other as half cousins.

Cousin-in-law: The cousin of a spouse. This would be a wife’s cousin or a husband’s cousin.

 

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