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When the cousins are separated by a different number of generations from the most recent common ancestor, the cousin relationship is "removed".
The difference between the number of generations for each cousin is the removal.
Sometimes you and your cousin may share a common ancestor, but you each call this ancestor something different.
For example, the common ancestor may be great-great grandparent.
For example, if the most recent common ancestor is 2 generations prior for one person and 3 generations prior for the other (one person's grandfather is the other person's great-grandfather) or the most recent common ancestor is 3 generations prior for one person and 4 generations prior for the other (one person's great-grandfather is the other person's great-great-grandfather) the cousins are separated by one generation and therefore once removed.
Two people can be removed but be around the same age due to differences in birth dates of parents children and other relevant ancestors.
The following table summarizes the average percent DNA shared for different types of relationships according to our simulations.
You may notice that several relationships share the same average percent DNA; this can account for a predicted relationship of aunt/niece for a pair of half sisters.
In the English system the cousin relationship is further detailed by degree and removal.
This is the "FIRST" or "SECOND" or "THIRD" part of the cousin relationship.
More generally, cousin is a type of familial relationship in which people with a known common ancestor are both two or more generations away from their most recent common ancestor.
Your great-great uncle is the brother of your great-grandfather or great- grandmother.
Your great-great aunt is the sister of your great-grandfather or great- grandmother.