In chapter 4, you will find a man who is about to hang himself. You need to stop him. Use the older brother to hold him in the air, and the little brother to go up the tree and untie the rope.
After that, go the pathway behind the tree to the burned house. Jump on the ledge, then on the beam on the right, then on the other ledge, and then go up. The doorway will unblock at this point, so pick the box, go the almost-hangman, and give it to him.