That's what you see on the surface; what you don't see is the family that owns more than half of the world's wealth: http://en.wikipedia.org/wiki/Rothschild_family. They basically run everything in the background for a pair of centuries. It's easy to doubt this, but google this.
While interesting to read about wealthy family similar to Swedens Wallenberg Family (http://en.wikipedia.org/wiki/Wallenberg_family) that also has similar claims about having sway over 1/3 of Swedens GDP (seems unlikely). Your link say nothing about them owning more than half of the world's, except for the conspiracy bit at the bottom. The conspiracy section is for what people believe about the family and not about the family itself.
