Since a millionaire ranges from "boomer home owner with a 401k" to "someone with $999,999,999.99" I thought this snippet was instructive:

Dosio was the owner of the Pacific AgriLands Inc which has its own 12,000 acre vineyard in Modesto but specialises in providing management for local wine farms. His son, Jeff, is President of the company which produces 40 percent of Californian wines. His other son, Blake, is a farmer and reportedly also worked in the family business. The company supports most local vineyards, including the famous E&J Gallo wines.