In Cynthia Lord’s novel Rules, Catherine’s relationship with David is a typical relationship between siblings with autism. Firstly, Catherine has to watch over David. The reason this is because Catherine is seen watching over David and babysitting him throughout the book. This similar to when Gracie Bourne said that she watches over Mac and goes to his doctor’s appointments. Another reason their relationship is typical is because Catherine is defensive of people with autism. In the book, Catherine defends David when people tease him. This is similar to how Rosie King is defensive for when people try to generalize people with autism. The last reason is their relationship is typical is because Catherine feels sometimes that she doesn’t get as much attention. During the book she sees David get more attention with him getting to go where he wants to and given things while Catherine doesn’t get what she wants. This is similar to how in real life Gracie Bourne said she felt the same but it didn’t bother her as much. That is why the relationship between Catherine and David is very similar to real relationship between siblings where one has autism.