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Mr. Nathan Radley told the kids that the tree was dying because he wanted to stop Boo Radley from contacting the outside world.
Nathan Radley is likely trying to prevent Boo Radley from making contact with the outside world through the tree. By saying that the tree is sick and needs to be cut down, he can keep Boo isolated and prevent him from communicating with Jem and Scout. Nathan's actions contribute to Boo Radley's continued seclusion and mystery in the neighborhood.
The kids stop trying to communicate with Boo Radley after the incident where Nathan Radley shoots at them while they are sneaking into his yard to leave a message for Boo. They realize that Boo might not want to interact with them, and they also understand that he prefers his privacy.
Nathan Radley tells Jem and Scout that he filled the knot-hole with cement because the tree was dying and he didn't want it to fall on someone. However, it is later revealed that he filled it to prevent gifts being left for the children by Boo Radley.
The person who closes up the knothole in "To Kill a Mockingbird" is Nathan Radley, Boo Radley's older brother. He fills it with cement to prevent communication between the kids and Boo, as he believes it is leading to trouble.
Thieves in his garden patch. (Actually, it's Scout, and her brother and Dill trying to get a peek at Boo Radley. Later, her brother's pants is found folded near the barbed-wire fence where he lost it during their hasty departure.)
Mr. Nathan Radley fills the knothole with cement in order to prevent the children from receiving any more gifts from Boo Radley. This action is seen as a way to cut off the relationship between Boo and the Finch children.
If talking of To Kill a Mockingbird, Scout and Jem are very cautious at the start of the book whilst walking past the Radley place. Scout once mentions to Dill that when Jem goes past the Radley place on his own he is always running.
Monsters scare little kids because they're strange and annoying.
The cemented hole in the tree represents Boo Radley's isolation from society. Nathan Radley fills the hole with cement to prevent Boo from communicating with Jem and Scout. Jem is heartbroken because he realizes the cruelty of this action.
Boo Radley
Yes he has a son.