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What is my mom's cousin's daughter to me?

Your mom's cousin's daughter is your second cousin, and you are her second cousin too.

3.13% shared DNA on average. Real amounts vary.

Diagram: how your mother's cousin's daughter is related to youYouMotherGrandparentGreat-grandparentscommon ancestorsGreat-aunt/uncleFirst cousin onceremovedSecond cousinthem

you them common ancestors double line: marriage

Your mom and her cousin are first cousins: they share grandparents. Their children, you and her daughter, share great-grandparents, which makes you second cousins.

The same holds for your mom's cousin's son and your dad's cousin's kids. Any child of your parent's first cousin is your second cousin.

How we worked it out

Follow the chain one step at a time:

  1. Your mother: mother (1 up, 0 down)
  2. Your mother's cousin: first cousin once removed (3 up, 2 down)
  3. Your mother's cousin's daughter: second cousin (3 up, 3 down)

Your great-grandparents are her 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 her. 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

    Are my parent's cousin's kids my second cousins?
    Yes. You and they are the same generation and share great-grandparents, which makes you second cousins.
    What is my mom's cousin's daughter's child to me?
    Your second cousin once removed.

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