Why does Scout quiz Atticus about his visit to the Radley house in To Kill a Mockingbird? How much does Atticus tell her?

In Chapter 8 of To Kill a Mockingbird, Mrs. Radley, Boo’s mother, dies. Atticus goes to pay his respects to the family since they are his neighbors.  Scout and Jem can’t wait to hear all about his visit because they are still obsessed with Boo Radley and the rumors that surround his life. Scout and Jem immediately assume that Boo somehow caused his mother’s death, but Atticus tells them that she died of natural causes.  This is disappointing for the children who yearn for another juicy tidbit about the mysterious Boo Radley.  Scout also asks Atticus if he saw Mr. Arthur (Boo).  Atticus tells Scout that he didn’t.  Again, it's another disappoint for Scout and Jem who want so desperately to meet and know Boo Radley.  As usual, Atticus is pretty closed-mouth about the Radley family in order to protect their privacy and to discourage any more antics from Scout and Jem who are trying to see Boo.