The child's antics grew with every day, and there came a day when the child wanted to test the limits of what he could do. Thus, the child kept his eyes on the family that lived next to him, a family of three—a loving family—that seemed to match with theirs. However, the child could see things about the family that the others didn't.
The child saw the affair the husband was going through. The child saw the hidden drug addiction problem of the mother, and the child saw the girl, a few years older than the boy, knowing it all yet hiding it all in plain sight, trying to act as if her life was going well. Thus, the child began his play.
He started to get friendly with the girl. To the girl, who found her own family feeling as if it's not worth anything, it didn't take long for the boy to become like a little brother to the girl, she came to care for him. From then on, it didn't take a lot of effort for him to rile up the rest from there.