one of his, her, or their
Tom le dio a Mary una de sus guitarras.
Tom gave Mary one of his guitars.
Lo llamo para decirle que una de sus máquinas está averiada.
I am calling to tell you that one of your machines is broken.
— Amelie (2001)
There comes one of her young.
Una de sus hermanas es enfermera.
One of her sisters is a nurse.
Una de sus aficiones es coleccionar camisetas.
One of his hobbies is collecting t-shirts.
Una de sus fans, seguro es el precio de la fama.
One of his fans—it's probably the price of fame.
— Caché (Escondido) (2005)