What is my husband's sister-in-law to me?
Usually your co-sister-in-law: your husband's brother's wife, who married into his family the same way you did. English has no everyday word for her, so that genealogical label or her first name does the job. The other woman who fits is your sister, since she is his sister-in-law too.
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Co-sister-in-law
English has no single formal word for this relative. “co-sister-in-law” is the label genealogists use.
- You
- Your husband
- His brother
- His wife
From the other side, you are their co-sibling-in-law.
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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Know she married your husband's brother? Here's what she is to you.
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
Who am I to my husband's sister-in-law?+
Her co-sibling-in-law, or her sister if she is your sister.
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.
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