Rothschilds family are the wealthiest. As far as I know they control this world and I heard that they are soul less.
I also believe that they are the ones too. They might have sold their souls to the devils to maintain that huge amount of money and they will always stay on the top no matter what happens. But there can also be another theory that they are just working for other people who has much more oney than them.
in my opinion the richest people are those who have succeeded in investing and benefiting a lot. and already know or understand how to get profits and how to play. everyone can become rich if that person wants to try to get ahead and always try.