What lines in this excerpt from act V of Romeo and Juliet show that the Capulet-Montague feud has brought tragedy not only to the two families but also to other families in Verona?

In the excerpt from act V of Romeo and Juliet, the lines that highlight the intergenerational tragedy caused by the Capulet-Montague feud are spoken by Lord Montague and Lord Capulet. They express profound regret for their actions in allowing the feud to escalate to the point of costing them their children's lives, which serves as a poignant reminder of the collateral damage inflicted upon other families in Verona due to their long-standing rivalry.