his/her/your/their new
La niña adoptada vivió una vida feliz con su nueva familia.
The adopted girl lived a happy life with her new family.
No sé si su nueva camisa le hará juego a sus jeans.
I don’t know if his new shirt will match his jeans.
Óliver descubrió que su nueva novia era una inmigrante ilegal.
Oliver discovered that his new girlfriend was an illegal immigrant.