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"Her" is an adjective which is often translated as "su", and "his parents" is a phrase which is often translated as "sus padres". Learn more about the difference between "her" and "his parents" below.
her()
An adjective is a word that describes a noun (e.g., the big dog).
1. (possessive)
a. su
Her children are very bright.Sus hijos son muy inteligentes.
I cannot stand her attitude any longer.Ya no puedo soportar más su actitud.
A pronoun is a word that stands in for a noun (e.g., she).
2. (personal)
his parents()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. sus padres
I've already met my boyfriend's friends. Now I just have to meet his parents.Ya he conocido a los amigos de mi novio. Ahora solo tengo que conocer a sus padres.