What is a son-in-law?
A son-in-law is the husband of your child. When your child marries, their spouse takes a child's seat in your family and you become a parent-in-law in return. The tie is affinal — made by marriage, not blood — though the grandchildren who often follow are yours by blood entirely.
Relationship
Son-in-law
- You
- Your child
- Their husband
From the other side, you are their parent-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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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.
FAQs
Is my son's husband my son-in-law?+
Yes — a child's husband is your son-in-law regardless of which child he married.
Who am I to my son-in-law?+
His parent-in-law — mother- or father-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.
No credit card needed. Your tree stays yours.
