It's Julia's watch. (Now change the possessive's to possesive adjective)
It's her watch.
That's my parent's room.
That's their room.
Those are my brother's and my DVDs.
Those are our DVDs.
It's Mr. Geen's laptop.
It's his laptop.
Are these Ana's books?
Are these her books?
This is the boy's ball.
This is his ball.
That's Rafa's pen.
That's his pen.
