Boo Radley looks after Jem, Scout and Dill as if they were his own children, although they do not realize it. Some examples of this are the gifts that Boo left in the hollow tree, and when he saved all their lives. The phrase "Boo's Children" is used here to represent the care wit which Boo observed the children, and how he was always there when they needed him. This is a stark contrast to how the children originally perceive him, as a threat and even a malevolent spook. The use of this phrase in Scout's narration in this part of the chapter shows how this idea has changed because Scout now sees that Boo never meant them harm, and in fact saved them several times. This represents the idea that everything has now become clear, through the prism of experience.