Big Brother has a friend visiting. This friend has a younger brother a little older than Little Brother, so he's used to being around small children.
Teenage boys who are used to being around little boys develop interesting strategies for dealing with them.
Friend: "Hey Little Brother, do you want $1.00?"
Little Brother: "Yes!"
Friend: "Go bother Big Brother."
Big Brother: "Little Brother, do you want $2.00?"
Friend: "A bribable child is a controllable child."