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a su hermano

his/her brother

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phrase Uncommon #13,354
his/her brother Su can also mean “their” or formal “your.” The a is often a grammatical marker for a person receiving or affected by an action and is not translated into English.
SP: Llamé a su hermano para darle la noticia.
EN: I called her brother to give him the news.

De rabia le pegó a su hermano.

In a fit of rage, he hit his brother.

Se ha ido a recoger a su hermano.

He has gone to pick up his brother.

— Running on Empty (1988)

Ella sigue a su hermano adondequiera que vaya.

She follows her brother wherever he goes.

Usted pidió llevar a su hermano a Los Álamos.

You asked to take your brother to Los Álamos.

— Oppenheimer (2023)

Acaba de perder a su hermano.

He just lost his brother.

— Pecadores (2025)

Ahora manda a su hermano a la Academia Militar de Tokio.

Now he sends his brother to the Tokyo Military Academy.

— El último emperador (1987)

Al fin encontró a su hermano desaparecido.

He finally found his missing brother.

Ella nunca más volvió a ver a su hermano.

She never saw her brother again.

Puercoespín envió ahí a su hermano a morir.

Porcupine sent his brother there to die.

— Stalker (1979)

¡Llame a su hermano para que venga a comer!

Call your brother and tell him to come eat!

Nos denunció a todos, a Jimmy, a mí y hasta a su hermano.

He reported all of us, Jimmy, me, and even his brother.

— Buenos Muchachos (1990)

Mary hizo llorar a su hermano.

Mary made her brother cry.

Están llorando porque extrañan mucho a su hermano.

They're crying because they miss their brother so much.

— Vuelven (2017)

Le pidieron a su hermano que les ayudara con su tarea.

They asked their brother to help them with their homework.

Él está escribiendo una carta a su hermano.

He is writing a letter to his brother.

En vez de ir él mismo, envió a su hermano en su lugar.

Instead of going himself, he sent his brother in his place.