Catherine's daughter, Cathy, grew up with no knowledge of Wuthering Heights or Heathcliff's existence.
Isabella gets sick and dies, sending Linton to live with her brother. Heathcliff gets word of this and gains custody of his son.
Catherine began a secret romance with Linton, starting out as letters and eventually visiting him as his health declined.
Heathcliff lures Cathy into Wuthering Heights and holds her prisoner until she marries Linton (so Heathcliff will gain complete control of Thrushcross Grange). Edgar gets sick and dies, followed by Linton not long after.
Heathcliff became obsessive over the memory of Catherine. He claimed to see her ghost and talked to it. Not long after, Heathcliff ended up dead.
Hindley's son, Hareton, inherited Wuthering Heights. Despite their original differences, Hareton and Catherine ended up falling in love and decided to marry.