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What is my mom's cousin to me?

Your mom's cousin is your first cousin once removed, and you are their first cousin once removed too.

6.25% shared DNA on average. Real amounts vary.

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

you them common ancestors double line: marriage

Your mom's cousin (or your dad's) is your first cousin once removed. Your common ancestors are your great-grandparents, who are your mom's cousin's grandparents. Your mom's cousin is one generation above you, so the relationship is “removed” once.

Many families call a parent's cousin “aunt” or “uncle” as a courtesy. That's normal; the exact term is still first cousin once removed.

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)

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

They are one generation above you.

Count the generations to your common ancestors: 3 up from you, 2 down to them. 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

    Is my mom's cousin my aunt?
    Not technically. An aunt is your parent's sister (or your parent's brother's wife). Your mom's cousin is your first cousin once removed, though calling her aunt is a common courtesy.
    Is my mom's cousin my second cousin?
    No. Second cousins are the same generation and share great-grandparents. Your mom's cousin is a generation above you. Her children, however, are your second cousins.
    What is my mom's cousin to my mom?
    Her first cousin. They share grandparents.

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