Um.. Im not able to zoom in to the picture I’m very sorry but it’s not letting me):
It should be their going home to personally look for it not them going home to personally look for it
I don't have the book so I can't give a line of evidence but Atticus was all about teaching Jem and Scout those little life lessons without them even noticing so this instance was one of those little lessons he gives them. Hope this helps :)
Answer:
The answer to this is by putting the characters in an non-realistic and non-believable setting.