Esmeraldo Ruspoli as Lady Montague.
Image Source: The Montague Family
In the first scene, Montague tries to join the street brawl, but his wife holds him back, saying, "Thou shalt not stir a foot to seek a foe" (1.1.80).
Later in the scene, after Prince Escalus has stopped the riot and dispersed the crowd, Benvolio stays behind with Montague and Lady Montague. Montague asks how the fight began, but Lady Montague is more interested in her son than in the fight. She says to Benvolio, "O, where is Romeo? saw you him to-day? / Right glad I am he was not at this fray" (1.1.116-117) [Scene Summary]
Shortly after Romeo kills Tybalt, a stage direction says, "Enter Prince, attended; Montague, Capulet, their Wives, and others"(3.1.141, s. d.), but Lady Montague does not speak. [Scene Summary]
When Montague arrives at the vault of the Capulets, Prince Escalus says to him, "Come, Montague; for thou art early up, / To see thy son and heir more early down" (5.3.208-209). This means that Montague is up early in the morning to see his son down (dead) early in his life. Before he sees the bodies, Montague says, "Alas, my liege, my wife is dead to-night; / Grief of my son's exile hath stopp'd her breath: / What further woe conspires against mine age?" (5.3.210-212). [Scene Summary]