Relationship Finder

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

Your sister's husband's brother has no standard English name and is not a blood relative.

Diagram: how your sister's husband's brother is related to youYouParentscommon ancestorsSisterBrother-in-lawSister's husband'sparentscommon ancestorsSister's husband'sbrotherthem

you them common ancestors double line: marriage

Your sister's husband is your brother-in-law, but his brother has no standard English name. He isn't a blood relative, and he isn't your brother-in-law: that term covers only your spouse's siblings and your siblings' spouses.

Most people just say “my brother-in-law's brother”.

How we worked it out

Follow the chain one step at a time:

  1. Your sister: sister (1 up, 1 down)
  2. Your sister's husband: brother-in-law
  3. Your sister's husband's brother: your sister's husband's brother

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    Related questions

    Is my sister's husband's brother my brother-in-law?
    No. Your brother-in-law is your sister's husband (or your spouse's brother). His brother is not.
    Could I marry my sister's husband's brother?
    Yes. You are not blood relatives.

    More family relationship answers