Miss Maudie felt nothing but compassion for Arthur Radley, but she felt genuine contempt for his father. She thought Old Mr. Radley was judgmental and unforgiving, the result of his zealous and unyielding religious views.
Similarly one may ask, what do the kids think of Miss Maudie?
Miss Maudie Atkinson is the one woman who Jem and Scout--and Atticus--can count on as a true friend in Harper Lee's novel "To Kill a Mockingbird." Unlike the unhappy morphine addict Mrs. Dubose and the gossipy Miss Stephanie, Miss Maudie keeps to herself except when a neighbor is in need.
What does Scout already believe about Boo?
Based off of the rumors, Scout believes that Boo is a violent individual capable of heinous acts. In Chapter 8, Mrs. Radley dies. Scout and Jem believe that Boo had finally killed his mother, but are disappointed when Atticus tells them she died of natural causes.
What might be the cause of the laughter in the house?
As the previous answer states, the laughter from inside the house is probably Boo Radley having a good chuckle as he watches the antics of the children outside his door. Scout never lets on to Jem and Dill that she heard it at all; she keeps it to herself.