how do aunt alexandra and the children differ in their attitudes towards bob ewwll's spitting at atticus

Aunt Alexandra thinks Ewell has a grudge he's going to grind.... she believes his actions mean that Atticus is in danger.

I wouldn’t be so sure of that, Atticus," she said. "His kind’d do anything to pay off a grudge. You know how those people are.

Scout and Jem believed in their father, his experience with people, and his explanation. They stopped worrying.

After that, we were not afraid. Summer was melting away, and we made the most of it.