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What is my grandpa's sister's husband to me?

Your grandpa's sister's husband is your great-uncle by marriage. He is related to you by marriage, not by blood.

Diagram: how your grandfather's sister's husband is related to youYouParentGrandfatherGreat-grandparentscommon ancestorsGreat-auntGreat-uncle bymarriagethem

you them common ancestors double line: marriage

Most families just say aunt or uncle.

Your grandpa's sister is your great-aunt, so her husband is your great-uncle by marriage. In practice he's just “great-uncle”.

His children with your great-aunt are your first cousins once removed. Children from his other relationships are not blood relatives.

How we worked it out

Follow the chain one step at a time:

  1. Your grandfather: grandfather (2 up, 0 down)
  2. Your grandfather's sister: great-aunt (3 up, 1 down)
  3. Your grandfather's sister's husband: great-uncle by marriage

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    Related questions

    Is my great-aunt's husband my blood relative?
    No. He's related through marriage only.
    What is my grandma's brother's wife to me?
    Your great-aunt by marriage.

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