* "Are you a brother?" This is the most literal translation, and it's often used in a playful or informal way.
* "Are you my brother?" This is a more common translation when the speaker is referring to a close friend or someone they consider a brother.
* "Are you a comrade?" This translation emphasizes the idea of shared goals and values, and it's often used in a political or ideological context.
The best translation of "ni xiong di ma" will depend on the specific situation and the relationship between the speaker and the listener.