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What is my grandma's niece to me?

Your grandma's niece is your first cousin once removed, and you are her first cousin once removed too.

6.25% shared DNA on average. Real amounts vary.

Diagram: how your grandmother's niece is related to youYouParentGrandmotherGreat-grandparentscommon ancestorsGreat-aunt/uncleFirst cousin onceremovedthem

you them common ancestors double line: marriage

Your grandma's niece is the daughter of your grandma's brother or sister. That makes her your parent's first cousin, and your first cousin once removed.

If she's your grandma's niece by marriage (your grandpa's sibling's daughter), the answer is the same, just through your grandfather. If she's a step-grandparent's niece, she isn't a blood relative.

How we worked it out

Follow the chain one step at a time:

  1. Your grandmother: grandmother (2 up, 0 down)
  2. Your grandmother's niece: first cousin once removed (3 up, 2 down)

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

She is one generation above you.

Count the generations to your common ancestors: 3 up from you, 2 down to her. The cousin number is one less than the smaller count (2), so first cousin. The counts differ by 1, so once removed.

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    Related questions

    What is my grandma's nephew to me?
    Also your first cousin once removed.
    What is my grandma's niece's daughter to me?
    Your second cousin.

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