What can the Sack represent in the Legend of el Silbon

So for Spanish I need to search for an urban legend (which i did) i wrote about the legend el silbon and its about this spoiled kid who was craving deer meat and told his dad to go hunt one. when his dad came back he didnt find any deer so the boy got mad and killed his dad. He gave his mom his dads organs so she can cooked them and then she noticed that it was her husband. His grandfather punished him by whipping his back until it bleed and squeezed a lemon so it will sting. He told the boy to leave with his dads remains in a sack and got chased by angry dogs. And eventually got killed but the dogs.