They are heartbroken.
Capulet is upset with Juliet's decision because the women back in that society were supposed to listen to what their father wants. When Juliet refuses to marry Paris, he feels as if she is rejecting his authority of the house. Capulet chose Paris because he is young, good-looking and very successful. To him, this is a perfect choice for a husband. However, Juliet refuses and this is an insult to him because it basically means that Capulet cannot chose a good husband for his own daughter.
The nurse told Juliet that her mother needed her. When Juliet left, Romeo asked "Who's her mother?". The nurse responded that Juliet's mother was Lady Capulet.
Two more corpses than were expected. He expected Tybalt to be there, but not Paris or Romeo. He expects Juliet to be there but she is not a corpse. Yet.
Paris had come to the Capulet tomb to mourn for Juliet. But who should he find there but that nasty banished Montague, Romeo, who is no doubt out to vandalise the Capulet tomb. Paris decides to make a citizen's arrest and to hold Romeo for coming to Verona when he is banished. Romeo asks him to please forget all about arresting him, as Romeo has no intention of harming anyone but himself. But Paris won't listen, so Romeo resists, there is a fight and Paris loses.
Juliet got buried in the tomb after they thought she was dead. Paris challenged Romeo to a fight and was killed just outside and Romeo dragged him inside. Romeo took poison right beside the body of Juliet.
Read the play. Or watch it. He says "Is she a Capulet?"
Bury it. It's what you do with corpses.
Romeo is well-known around Verona - even Old Capulet has heard of him (as we find out in the argument Old Capulet has with Tybalt in the Ball scene). But Romeo has never seen Juliet before he meets her at Old Capulet's ball. This is surprising in a town as small as Verona. Perhaps Old Capulet has kept Juliet at home most of the time. This would make sense: she is his only surviving child, and she seems very naive in the ways of the world until she meets Romeo. (When Lady Capulet asks her if she wants to marry Paris, Juliet seems not to have given the matter much thought). But once Juliet has chosen Romeo she does everything she can so that they can be married without a moment's hesitation. Juliet grows up fast, and - like most of Shakespeare's heroines - she knows what she wants.
Juliet asks the Nurse to find out Romeo's identity at the Capulet ball, as she has fallen in love with him and wants to know who he is.
None of them. In Act 2 the conflicts are forgotten as Romeo and Juliet find that they love each other arrange their wedding and get married. Conspicuous by their absence from the act are the causes of conflict: the family feud, usually personified in Tybalt and later in Lady Capulet, and the arranged marriage, personified in Capulet and Paris.
The friar offers Capulet consolation by telling him that Juliet is in a better place now, free from the troubles of the world, and that one day they may find peace in the memories they shared with her. He reminds Capulet that death is a natural part of life and that they must find comfort in knowing that Juliet is at rest.
Because Paris is closely related to the Prince and he is a "County", which is to say, a Count. He is a nobleman. The Capulets, on the other hand, are nouveau riche bourgeois types. They are wealthy enough, they "have the chinks", but do not have the social status or political power that nobility would give them. Although you may have seen Capulet called "Lord Capulet" he is not a Lord and you will not find him called so in any reputable edition of the play. Actually "Lady Capulet" is not so called in any of the original texts of the play either; she is "Capulet's Wife" or "Juliet's Mother", and at the beginning of the lines "Wife", "Old La.", "Lady" and "Mo" somewhat indiscriminately.