vs
QUICK ANSWER
"Her" is an adjective which is often translated as "su", and "them" is a pronoun which is often translated as "los". Learn more about the difference between "her" and "them" below.
her(
huhr
)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)
them(
thehm
)A pronoun is a word that stands in for a noun (e.g., she).
a. los (masculine)
It's been a long time since I talked to my brothers. I want to see them!Llevo mucho tiempo sin hablar con mis hermanos. ¡Ya los quiero ver!
b. las (feminine)
My aunts just arrived at the bus station. We need to go pick them up.Mis tías acaban de llegar al terminal de autobuses. Hay que ir a recogerlas.
b. se (used with direct object pronoun)
Why are they asking for the payment? I already gave it to them!¿Por qué están pidiendo el pago? ¡Ya se lo di!