Yes, but why is it always plural in its own right when we are addressing a single person?
'Juus esi cuuka' manupraat izklausaas burviigi :)

but okay...

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That would be like saying "They is". :)

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To me, it's kind of similar to English use of 'their', when you don't know if the person you're speaking about is male or female. 'Somebody left their bag here', for example. You're speaking about one person, but the possesive pronoun is in plural.

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