 This can only be achieved, however, by Heathcliff's forcing his and Isabella's son Linton into marriage with Catherine's daughter, who is called Cathy.After Catherine Earnshaw's death, Heathcliff's vindictive cruelty intensifies, aimed at destroying not only his enemies but also their heirs — Hareton, son of Hindley and Frances Earnshaw, and Catherine, daughter of Edgar Linton and Catherine the elder.Heathcliff forces his sickly son, Linton, who entirely resembles his mother, Isabella, into marriage with Catherine Linton, daughter of Cathy and Edgar, in a bid to gain control of Thrushcross Grange.