What is my stepbrother's daughter to me?
Your stepbrother's daughter is your step-niece. Your stepbrother holds a sibling's seat through a parent's remarriage, so his children take the niece and nephew seats — informally, because English has no official titles this far into the step-family. No blood connects you; the whole line runs through the marriage that blended your families.
Relationship
Step-niece
English has no single formal word for this relative — “step-niece” is the label genealogists use.
- You
- Your stepbrother
- His daughter
From the other side, you are their step-aunt or step-uncle.
Step relationships run through a remarriage, not a shared ancestor, so the ancestor chart can't draw them.
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
What would my stepbrother's daughter be to me?+
Your step-niece — informal but clear. There's no official English term for a step-sibling's children.
Who am I to my stepbrother's daughter?+
Their step-aunt or step-uncle.
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.
