His father had him locked up after Boo had committed some minor crimes. He thought it was shameful that his son should go to a juvenile delinquent centre so he wanted to carry out his own form of punishment.
Jem and Dill get the idea to write a note to Boo Radley asking him to come outside and tell them what he does inside his house. Furthermore, they write that they will buy him an ice cream and will not hurt him. They put the note on the end of a fishing pole and try to attach it to a window shutter on the side of Boo's house.
Charles Baker Harris (Dill), who visits his aunt Rachel every summer in Maycomb came up with the idea of getting Boo Radley out of his house. Scout, Dill, and Jem try to do this with several different strategies.
Scout just wants to see Boo Radley come out of his house.
Arthur Radley. his brother was mr. Nathan radley.
Scout comes home with a rolled piece of gum that she found in the knothole of the tree at the Radley place. It is believed that the gum is left by Boo Radley.
from boo radley
Boo Radley gave the blanket to Scout when Ms. Maudie's house caught on fire.
dill did, it's mentioned right in the beginning on the first page "..., when Dill first gave us the idea of making Boo Radley come out"
they use a fishing pole to try to give "boo" a note asking him to come out.
Jem usually mends his own pants when they need fixing.
Boo Radley saves Jem and Scout from Bob Ewell in To Kill a Mockingbird.
Nathan Radley (the oldest) and Arthur "Boo" Radley (the youngest)