What is the plural of "next of kin"

[Doughtsh]

I have a next of kin (which as I understand it can only be one person). My friend also has a next of kin (which is someone else). How would I describe those people - our "nexts of kin" sounds so wrong, as does "next of kins", or do we just give up and talk about our closest relatives?

[Shyone]

Next of kin: The person who is (or persons who are) most closely related to a given person.

So 'next of kin' is also the plural.
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