2

Do you still call them as NeeChan/ NiiChan or OneeSan/ OniiSan? Or just their name?

4

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.

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