What is my brother's brother-in-law to me?
Two different men fit. Your brother's wife's brother is your brother's brother-in-law, and he is not your in-law, so English has no word for him. Your sister's husband is a brother-in-law to your brother as well, and he is your brother-in-law too. If you are the sister he married, he is your husband.
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Brother's brother-in-law
English has no word for this person. The marriage that links you is your relative's, not yours, so they aren't your in-law, and families just say “brother's brother-in-law”.
- You
- Your brother
- His wife
- Her brother
From the other side, you are their sibling-in-law's sibling.
This connection runs through a marriage, not a shared ancestor, so the ancestor chart can't draw it.
The calculator below works out blood relationships through a shared ancestor — use it to explore the rest of your tree.
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Asking about his wife's brother? That one has its own answer.
This relationship sits outside the shared-ancestor model, so the card above carries the answer and the calculator opens in its default state. Work out any blood relationship with it, or open the full relationship calculator.
Related questions
FAQs
Is my brother's wife's brother related to me?+
Not by blood and not by your own marriage. He is family to your brother, so most people just use his name.
Who am I to my brother's brother-in-law?+
To his wife's brother you are his sibling-in-law's sibling. To your sister's husband you are a sibling-in-law.
Does the calculator store my family details?+
No — it runs entirely in your browser. Nothing you enter is uploaded or saved on our servers.
Start with one relative and see what comes back.
Add what you remember and AncestorIQ searches for the rest. Free to build your tree for as long as you like.
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