The feuding started in Act 1 Scene 1, when the Capulets and Montague servants confronted each other. The Capulets' servants insult the Montagues and this leads to a street brawl of the two families. Furthermore, in Act 3 Scene 1, the hatred between the families gets worse. When Tybalt wanted revenge against the Montagues, he then confronted Romeo and Mercutio and started a duel. In addition, the feud between the families got even worse, when Tybalt killed Mercutio. Also, in Act 5 Scene 3, Tybalt challenges Romeo to fight and Romeo kills him.
The street in Verona, a public place, is where the feuding starts between the two families. In Act 1 Scene 1, Sampson and Gregory, servants for the Capulets, insulted the Montagues' servants, Balthasar and Abraham. This leads to a fight, which involves the Lords of both families and the Prince. No death occurred, but the families' attitudes against each other were worse than before. This created hate between the families, which lead to violence. In like manner, another duel between the two feuding families starts up, again, in the street of Verona in Act 3 Scene 1. When Mercutio and Benvolio, friends of Romeo, are confronted by Tybalt, who still hates the Montagues. Tybalt thinks that they crashed the Capulets' ball and he wants revenge. Mercutio and Tybalt fight each other. Now, Romeo arrives trying to stop the argument. Tybalt draws his sword and challenges Romeo. Romeo refuses to fight and Mercutio steps in to meet Tybalt's challenges. Romeo again, tries to stop the fighting, but Tybalt stabs Mercutio under Romeo's arm. Mercutio dies from his injury and this