Summer

The story's setting takes place in the summer, which represents the hot tempers that will flare during the course of the story.

Lemonade

Not only is this the product that both brother and sister decide to sell, but it is also represents their relationship. It can be bitter, but is best served sweetened and enjoyed with friends.

Flies

Flies show up in the story many times. At first they are mentioned as fruit flies that cloud up when Jessie is in the kitchen. Because these flies are small, at that time, they represent that the problems that she's having with her brother are still quite small. Later, she finds a number of house flies, much larger in size. These are the flies that she uses to pollute Evan's lemonade with. This indicates that their relationship has been polluted by this problem that they have going on...