What does Mi hermana es la mean in English?

"Mi hermana es la" is incomplete in Spanish. It means "My sister is the...". To complete the sentence, you need to add an adjective or a noun after "la."

Here are some examples:

* Mi hermana es la mayor. (My sister is the oldest.)

* Mi hermana es la más inteligente. (My sister is the most intelligent.)

* Mi hermana es la que cocina mejor. (My sister is the one who cooks best.)

* Mi hermana es la que vive en Madrid. (My sister is the one who lives in Madrid.)

Please tell me what you want to say after "la" and I can give you a more precise translation!