Emily Brontë's Wuthering Heights (1847) is the story of two neighboring families across two generations, and it is nearly impossible to follow without holding their tree in mind. On the windswept moors stand two houses: Wuthering Heights, home of the Earnshaws, and Thrushcross Grange, home of the gentler Lintons. Into the Earnshaw household the elder Mr. Earnshaw brings a foundling, Heathcliff, whose consuming bond with Catherine Earnshaw — and his exclusion from her class — becomes the wound the whole novel turns on.
The genius of the structure is how the two families interlock and then repeat. In the first generation, Catherine Earnshaw marries Edgar Linton while loving Heathcliff, and Heathcliff, in revenge, marries Edgar's sister Isabella. In the second generation Brontë rhymes the whole arrangement: Catherine's daughter, Cathy Linton; Heathcliff's sickly son, Linton Heathcliff; and Hindley Earnshaw's son, Hareton, are moved like pieces as Heathcliff schemes to seize both houses through marriage and inheritance. The same handful of names — Catherine, Linton, Earnshaw — recur across the two generations, so that the second half of the book deliberately shadows the first.
As a genogram, Wuthering Heights is a revenge plot drawn in marriages. Heathcliff's aim is to collapse the two family lines into his own grip — to own the Heights and the Grange by controlling who marries whom — and every union in the book is a move in that campaign rather than a romance. The families are a closed system of two houses, and the moor between them is crossed only by marriage, elopement, or death. The narrators, the housekeeper Nelly Dean and the tenant Lockwood, exist mainly to help the reader keep the branches straight.
The Earnshaw and Linton family map endures because the repetition is the meaning. What one generation does to the other — the cruelty, the thwarted love, the seized inheritance — is worked out a second time on the children, until Cathy and Hareton finally break the cycle Heathcliff set spinning. Brontë built a two-house genogram where the sins and the very names descend intact, which is why the novel is nearly always read with the family tree in view.
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