How do you call brother in Chinese?

It depends on whether you're referring to an older or younger brother, and whether you're using formal or informal language. Here are some common ways to say "brother" in Chinese:

Formal:

* 哥哥 (gēge): Older brother

* 弟弟 (dìdi): Younger brother

Informal:

* 哥 (gē): Older brother (used by younger siblings or close friends)

* 弟 (dì): Younger brother (used by older siblings or close friends)

Note:

* You can also use 兄 (xiōng) for "older brother" and 弟 (dì) for "younger brother" in formal writing or speech.

* In some dialects, there might be different words for "brother," but these are the most common Mandarin terms.

It's best to use the appropriate term depending on the context and your relationship with the person you're addressing.