>>>No, just differentiating between father's brother, mother's brother, or spouses of parents' sisters. So we have three words there. Then a cousin is actually a brother/sister of {appropriate uncle/aunt term} - "sestra od ujaka" is mother's brother's daughter.
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>>Interesting. I haven't read the discussion (as always), but can not pass an opportunity to jump in saying that in Russian we don't have such distinguish in uncles/aunts.
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>>AFAIK we don't have them in Hebrew either.
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>>I guess we do have in Spanish, but I don't know Spanish.
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>Not in Spanish AFAIK. Seems to me it's tio and tia.
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>Not French either, I think. Mon oncle, maybe?
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>So maybe just the Slavic languages?
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>Tamar

Not all Slavic, since it's not in Russian either. But I think it must be in other languages.