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What is my great-aunt's grandchild to me?

Your great-aunt's grandchild is your second cousin, and you are their second cousin too.

3.13% shared DNA on average. Real amounts vary.

Diagram: how your great-aunt's grandchild is related to youYouParentGrandparentGreat-grandparentscommon ancestorsGreat-auntFirst cousin onceremovedSecond cousinthem

you them common ancestors double line: marriage

Your great-aunt is your grandparent's sister. Her grandchildren are in your generation, and you share great-grandparents with them, so they are your second cousins.

Her children (one generation up) are your first cousins once removed.

How we worked it out

Follow the chain one step at a time:

  1. Your great-aunt: great-aunt (3 up, 1 down)
  2. Your great-aunt's grandchild: second cousin (3 up, 3 down)

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

Same generation as you.

Count the generations to your common ancestors: 3 up from you, 3 down to them. The cousin number is one less than the smaller count (3), so second cousin. The counts are the same, so not removed.

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    Related questions

    What is my great-aunt's daughter to me?
    Your first cousin once removed.
    What is my great-aunt's great-grandchild to me?
    Your second cousin once removed.

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