Nathan filled the knothole in the tree to prevent Boo from giving the children gifts. To trick the children, he told them the tree was sick and the knothole needed to be filled.
Answer:
Shirley Jackson's "Charles" is a short story about a kindergartner named Laurie who tells his parents about the daily antics of his classmate, Charles. Every day, Laurie describes instances where Charles hurts other students and is generally a bad influence. Laurie's parents are aghast at the described behavior and become fascinated by what kind of parents must have raised Charles, believing themselves superior. While attending a PTA meeting, Laurie's mother learns that there is no one in Laurie's class named Charles.
I don't think this answer is any better but here it is.
