#and just like Cathy and Hindley she ends up without a gift presumably because of Heatcliff

[salt-cedar]

Re-read the book and remembered that actually no one refers to Heathcliff as Cathy's or Hindley's brother, like, ever, even at the time mr. Earnshaw was alive. So, the interpretation of Heathcliff and Cathy's relationship as symbolically incestuous is completely out of the left field. However, if you read the Wuthering Heights as a sort of family saga where the broader themes are developed in different ways through different generations of one family, Heathcliff is absolutely a part of Earnshaw clan with its core theme of being unforgiving and vengeful. And I am adamant that in that sense Nelly is also an Earnshaw sibling.

(plus her being Hindley's foster sister because her mother nursed Hindley, which makes her care about Hindley and Hareton a lot despite them both being horrible. She is kind of mirroring Cathy in that way).