Why did Michael Jackson's family sue his promoters for 40 Billion Dollars?

Michel Jackson was made what he became by his promoters. His doctor already has a case against him for giving the prescription drug that killed him.

Michel must have been under a lot of stress of all the concerts and specially the Child sex scandal he was accused of (I thought that would have ended his career) He had to give a large some of money to hush the matter up

It was natural he took prescription drugs to keep him going without quitting

But why is the Jackson family (they are already a rich family by any standards)want 40 billion dollars from his promoters and if they get this money what will they do with it