Heathcliff, Edgar & Cathy and Heathcliff, Hindley & Catherine

Consider the generational relationships in Emily Bronte’s Wuthering Heights – Cathy, Heathcliff, and Edgar vs. Catherine, Hareton, and Heathcliff. What parallels are there? What significant differences are there? What changes that allows the second generation to find some measure of contentment in life? Is it personality, economics, social class changes? Do you think that Catherine and Hareton in particular learned anything from seeing how the adults around them behaved and the consequences of that behavior?