William Shakespeare's Romeo and Juliet (c. 1595) is a tragedy defined entirely by two families — "two households, both alike in dignity," as the prologue announces. In the city of Verona, the Montagues and the Capulets are locked in an ancient feud whose origin no one remembers, and it is into that inherited hatred that the play's young lovers are born. The family names are not background here; they are the obstacle, the plot, and the tragedy all at once.
The two houses are drawn as mirror images. Romeo is the only son of old Montague and Lady Montague; Juliet is the only daughter of Capulet and Lady Capulet, promised by her father to the eligible Count Paris. Around each child Shakespeare arranges kin and household who carry the feud forward: on the Capulet side, the hot-tempered cousin Tybalt and Juliet's Nurse; on the Montague side, Romeo's friends Benvolio and the kinsman Mercutio, who is related to Prince Escalus, Verona's ruler. The Prince stands above both houses, trying and failing to keep their private war off the public streets.
As a genogram, the play is a study in how a feud between two family lines consumes the single heir of each. Every death compounds the structure: Mercutio's killing by Tybalt, Tybalt's by Romeo, and finally the lovers' own — each loss a branch cut from one house or the other. The secret marriage of Romeo and Juliet is an attempt to fuse the two trees into one, and the tragedy is that the families can only be joined in the tomb, their reconciliation bought with both their children.
The Montague and Capulet family map endures because the whole tragedy is legible in the two surnames. To love across that line is fatal, and Shakespeare makes the feud feel older and larger than any of the people caught in it. The play is the archetype of the divided-house tragedy — two family trees that cannot touch without breaking, reconciled at last over the bodies of the only children they had left.
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