Cathy grows into a child and she meets her cousins Hareton and Linton. These chapters are significant because it develops the character of Cathy and introduces Linton into the story.
Contribution to plot Chapter 18 illustrates the level of nurtured Cathy received as a small girl and the level of trust they had with her. Chapter 19 shows the unawareness of Cathy as she did not recognize her own cousin and automatically assumed for him to serve her.