5. James & Arthur Irving

•  Net Worth: $4.5 B                                                                      
•  Source of Wealth: diversified, inherited and growing
  
•  Citizen: Canada

With fortune stranding at five billion US Dollars, James and Arthur are brothers with most money. Sons of Kenneth Colin Irving, they are the leading face and owners of Irving Group of Companies which is privately run by them. It is involved in diversified businesses like oil, natural gas, pulp and paper, etc.  Together, they are third richest persons in Canada