No, I think the timeline works out (to confirm that Linton is Heathcliff's son) and that Linton may even have been more premature, perhaps a contributing cause to his continuing bad health.
But when I first read that Isabella gave birth, I wondered too if Heathcliff was the father. Honestly, I could not (and still cannot) imagine Heathcliff having sex with Isabella. He made it very clear that he was revolted by her; I can't see him lowering himself to actually sleep with her, and thus degrade Cathy's memory. I can't even see him doing it out of spite; others may disagree with me on this, but I just can't imagine him doing it.
Still, however it happened, I still believe Linton is his child. And I'll tell you why. Remember when Nelly first sees Linton (he's about a year old); she sees all his external resemblances to Isabella - fair skin and hair, slender frame, etc., but she notices a peevishness or sullenness in his eyes, even at that young age. THAT, I think, is the Heathcliff in Linton. I know that sounds rather accusatory (after all, the boy cannot control who his parents are) BUT Nelly even voices that thought much later in the book. When Linton has married Cathy and is lording it over Thrushcross Grange with no pity for his suffering wife, Nelly cries "that's your father in you" or something similar. I really believe that's the undeniable proof that Heathcliff is his father.
Hmmm, this is really interesting. I'm sure someone could find even more proof for this incest-theory as an alternate interpretation of the book. It would completely revolutionize the way we interpret the novel.



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