Heathcliff's revengeful fury knew no bounds, he tortured Hareton Earnshaw, son of Hindley Earnshaw; and it feels bad to look at the kid because he is similar to Katherine. Hareton, the true heir of Wuthering Heights, grew up without the inheritance of his father, becoming a mere servant of the house, suffering from Heathcliff all the humiliations that Hindley had imposed upon him in the past. Hareton grows without access to education and any social right, living in the most complete servitude.
