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Do you still call them as NeeChan/ NiiChan or OneeSan/ OniiSan? Or just their
name?
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question
politeness
How do Japanese call their friend's sister or brother?
兄ちゃん and 姉ちゃん are friendly way of saying. お兄さん and お姉さん are more polite than
them. And When you call your friend's brother and sister, you say
～さんの姉ちゃん、お姉さん、兄ちゃん、お兄さん or just their name.
CC BY-SA 3.0
2015-12-18T09:44:13.403
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answer