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What is my cousin's grandchild to me?

Your cousin's grandchild is your first cousin twice removed, and you are their first cousin twice removed too.

3.13% shared DNA on average. Real amounts vary.

Diagram: how your cousin's grandchild is related to youYouParentGrandparentscommon ancestorsAunt/uncleFirst cousinFirst cousin onceremovedFirst cousin twiceremovedthem

you them common ancestors double line: marriage

Your cousin's grandchild is two generations below you, so they are your first cousin twice removed. Your common ancestors are your grandparents, who are the grandchild's great-great-grandparents.

To your own grandchildren, your cousin's grandchild is a third cousin: same generation, shared great-great-grandparents.

How we worked it out

Follow the chain one step at a time:

  1. Your cousin: first cousin (2 up, 2 down)
  2. Your cousin's grandchild: first cousin twice removed (2 up, 4 down)

Your grandparents are their great-great-grandparents: they are your common ancestors.

They are 2 generations below you.

Count the generations to your common ancestors: 2 up from you, 4 down to them. The cousin number is one less than the smaller count (2), so first cousin. The counts differ by 2, so twice removed.

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    Related questions

    What is my cousin's grandchild to my child?
    A second cousin once removed.
    What does my cousin's grandson call me?
    Formally you are his first cousin twice removed too. Many families use “great-aunt” or “great-uncle” as a courtesy title.

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