Perhaps, but the next gen of these families don't always retain the power and influence that the older generations had.
"These international bankers and Rockefeller-Standard Oil interests control the majority of newspapers and magazines in this country. They use the columns of these papers to club into submission or drive out of office public officials who refuse to do the bidding of the powerful corrupt cliques which compose the invisible government." (New York City Mayor John Hylan - New York Times, March 27,1922.)