The Wong family are rich. So rich that the bought 1/2 of Mars. They got rich by herding buggalo. Then Mr. Wong decides to build a giant miniature golf course bulldozing 12% of the galaxy. If you add all his corrupt/sleazy transactions to bypass some laws and property, he is very rich.
But how rich? Is there a comparison between his family and another? Can he be considered richer than Mom's corporation?