The Kohlers – $8.3B
We are sure you have already heard of Kohler Company if you have ever had to get your plumbing fixed. This Wisconsin-based firm is one of the biggest manufacturers of plumbing supplies, after all. Currently chaired by Herbert Kohler, Jr., he inherited the business after it was passed down from generation to generation of Kohlers. At the age of 33, he was overseeing the day-to-day affairs of this company. The financial success of the firm allowed the family the opportunities to invest in manufacturing, hospitality, and government.

The Kohlers – $8.3B