How do you say Tiene una hermana in English?

The English translation of "Tiene una hermana" depends on the context and the desired level of formality. Here are some options:

Formal:

* She has a sister. (most common and neutral)

* She possesses a sister. (more formal and less common)

Informal:

* She's got a sister.

* She has a sis. (very informal, can sound childish)

The best translation will depend on the situation and your relationship with the person you are speaking to.