How do you say brother in Cantonese?

There are a few ways to say "brother" in Cantonese, depending on the context and the relationship:

Formal:

* 哥哥 (gā gē) - Older brother

* 弟弟 (dī dī) - Younger brother

Informal:

* 阿哥 (ā gē) - Older brother (informal, often used by younger siblings)

* 阿弟 (ā dī) - Younger brother (informal, often used by older siblings)

* 兄弟 (hing dai) - Brother (general term, can be used for any brother)

Other:

* 大佬 (daai lou) - Big brother (used for older brothers in a group, can be used with a bit of respect)

* 細佬 (sai lou) - Little brother (used for younger brothers in a group, can be used with a bit of affection)

The specific term you use will depend on your relationship with the brother and the tone you want to convey.