Depends, in the movie Romeo sees Juliet next to the nurse, her fiance and her mother. Like this, right away he figured out she was a Capulet.
In the book, Romeo is told by the nurse that Juliet belongs to the Capulet Family.
Benvolio tells Romeo that Juliet is a Capulet at the party.
Romeo tells Tybalt that he loves him before the fight goes down because not even a day before he had wed Juliet. Tybalt being Juliet's cousin would make Tybalt now his family. This is why Romeo says that he loves him. As back then loving your family was important.
Balthasar, Romeo's servant, brings the news of Juliet's death.
When Juliet drinks the poison, they lie her to rest in the family tomb. Benvolio tells Romeo that is where she is, and he goes there to kill himself. i think Paris goes to visit her body and Romeo kills him.
They both learn their respective identities from the nurse: Romeo first, then Juliet.
Romeo's servant Balthazar tells him the news from Verona.
Benvolio tells Romeo that Juliet is a Capulet at the party.
Juliet's Nurse tells Romeo that Juliet is a Capulet, while Romeo's friend Benvolio reveals to Juliet that Romeo is a Montague.
at first she doesn't, but he tells her he is there eventually
Juliet's Nurse tells both Romeo and Juliet who the other's identity was.
Balthasar
The Nurse
Romeo's friend Balthasar tells him
Romeo tells Tybalt that he loves him before the fight goes down because not even a day before he had wed Juliet. Tybalt being Juliet's cousin would make Tybalt now his family. This is why Romeo says that he loves him. As back then loving your family was important.
Benvolio(Romeo's Cousin), tells Romeo to forget Rosaline (Romeo's love before he met Juliet) and to go to the Capulet's party to meet other girls
Balthazar tells him about Juliet's death and burial.
Balthasar, Romeo's servant, brings the news of Juliet's death.