What is a first cousin?
Your first cousins are the children of your aunts and uncles. You and a first cousin share the same grandparents: each of you is two generations below that common ancestor. First cousins are the closest cousin relationship, one step further out than siblings.
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The calculator above is preloaded with this relationship. Change either person to work out any other connection, or open the full relationship calculator.
FAQs
How many grandparents do first cousins share?+
First cousins share one set of grandparents — the parents of the two siblings who are their parents.
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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