How is your brother in French?

There are a few ways to say "How is your brother?" in French, depending on the level of formality and the gender of your brother:

Formal:

* Comment va votre frère? (This is the most formal way to ask.)

Informal:

* Comment va ton frère? (If you know the person well and your brother is male.)

* Comment va ta sœur? (If you know the person well and your brother is female.)

More informal:

* Ça va ton frère? (If you're very casual with the person.)

* Comment il va, ton frère? (If you're asking about a specific brother.)

It's important to choose the right level of formality based on your relationship with the person you're talking to.