His ( or her) first car.
"Éste es su auto" = This is his car "Es su coche" = It's his car
His/her/their passion is.
According to their family
Your hair is very pretty.
Quel était le nom de votre premier instituteur ? means "what was the name of your first teacher?" in English.
su coche
¿Qué color es su coche?
"Éste es su auto" = This is his car "Es su coche" = It's his car
Su autorización - Its okay
Su hyun
Your boy.
"Su hermana" means "his/her sister" in English.
The cast of Su primer baile - 1990 includes: Teresa Carrillo as Chica Luis Pastor as Chico
"Su casa" means "your house."
Estoy a su bebe in English means I am a baby.
It means "In your house".
It depends on context. It can be his, her, your, their.