Ok this is gonna come off as arrogant, and none of this wealth is my own but oh well.
My dad is CEO of a company that sells microwave components to HP, Techtronics, Department of Defense, Honeywell, etc. He also has a pretty extensive stock portfolio.
My family also has mineral rights on a large piece of property in North Dakota that has oil underground, and a company is gonna begin drilling there soon, so I'll get some royalties from that.
Sooooo, tech and oil money pretty much sums it up.