How do the children respond to the two men?

The children are intrigued and amused by the two men. However, they are also distrustful of the men's motives.
In the story, the narrator and her sister, Cathy, watch as two visitors walk onto their grandparents' property. The men tell Granny Cora that they are taking pictures for the county food stamp campaign.
As the men explain their reasons for trespassing on Granny's property, Cathy giggles. Although the text doesn't explain why Cathy reacts this way, we can make an informed guess as to why she does so. First, the text hints that Granny is intolerant of all forms of incivility. We can see this in her reaction regarding the boorish individual taking pictures of a man on the verge of suicide.
Granny obviously dislikes those who willfully exhibit bad manners. So, Cathy may have been amused by the ignorance exhibited by the men. After all, they have completely miscalculated Granny's tolerance for rudeness. Meanwhile, two other children are also observing the events before them. They are the twins from next door, Tyrone and Terry. Both Tyrone and Terry exhibit curiosity and distrust towards the two men.
By the end of the story, we understand why the children respond with little surprise at Granddaddy Cain's actions. They may have been originally curious, mistrustful, or even amused by the men's presence. However, they had little doubt that, once Granddaddy Cain returned, he would address the situation accordingly. Like Granny Cora, Granddaddy Cain is similarly intolerant of all forms of incivility.