Their money came from bootlegging, where the father was an associate
of the Bronfman's. They were considered the bluest of the bluebloods,
but for being social royalty, everyone one of them crossed the racial
barrier in their marriages.
As far as Caroline Kennedy being qualified as a senator, it really
makes no difference. You have Barney Franks, Barack Obama, Nancy Pelosi,
and countless other unqualified clowns.