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Children with a common grandparent are first cousins. Children with a common gt grandparent are second cousins - so the degree of cousinship is always one more than the number of greats to the common ancestor.

That's fine if the two people in question are of the same generation; otherwise you can count down to the lowest shared generation counting one more removed for each further generation down.

No I don't understand what that last bit means either! Jonathan Brind.