1.1: Lord Capulet runs out into the street and tries to join in the brawl between the servants of the Capulets and Montagues. His wife holds him back. At the end of the scene, the Prince reprimands Lord Capulet and orders him to come talk about ending the violence in the streets.
1.2: When Paris asks for Juliet's hand in marriage, Lord Capulet tells him that Juliet is too young to get married. ("Too soon marred are those so early made," he says, clearly referencing his own wife, whom he married when she was younger than Juliet. In retrospect, Lord Capulet seems to think that marrying her when she was so young was a bad idea.) He also says he will not agree to let anyone marry Juliet unless his daughter consents to the match. He suggests that Paris start to get to know Juliet at the party the Capulets are holding that night.
1.5: Lord Capulet is in host mode at the party. But when Tybalt wants to fight Romeo for daring to crash the party, Lord Capulet reveals a violent side. He furiously orders Tybalt to ignore Romeo and not to ruin the party.
3.1: Here he has no lines, but Lord Capulet is probably with his wife when they discover that Tybalt has been killed by Romeo. Shakespeare leaves all the verbal grieving to the women.
3.4: Paris, with classic bad timing, arrives to discuss wedding plans while the family is in mourning for Tybalt's death. Lord Capulet, worried by his daughter's frantic grief over her cousin's death, decides that marriage might help her recover. He decides that Juliet and Paris should be married later that week.
3.5: Lord Capulet expects that Juliet will be grateful that he has found her a handsome and eligible husband. Instead, she refuses to marry Paris and can give no clear explanation why. Lord Capulet is furious at his daughter's rejection of his plan. He tells her that she can either obey him and marry his friend Paris, or that she can leave his house and live in the streets.
4.2: Lord Capulet is going on with his preparations for the wedding, whether or not Juliet likes it. Happily for him, she comes back from a visit to Friar Laurence and apologizes for her behavior. Lord Capulet rejoices at her agreement to marry Paris and decides to move the wedding to the very next day. He doesn't care if he has to stay up all night – he wants to make it happen immediately.
4.4: Lord Capulet is bustling around happily making all the last minute arrangements for the wedding. He orders the Nurse to wake up Juliet. Paris is about to arrive at the house.
4.5: The Nurse discovers Juliet dead. Lord Capulet mourns over the loss of his only child. "Death is my son-in-law," he laments.
5.3: Lord Capulet thought his daughter was already dead, and then he discovers her bleeding on the floor of the family tomb. In grief at their children's death, both Lord Capulet and Lord Montague vow to end the fighting between their families and to raise a golden statue in memory of each other's child.