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Possibly.

Have you read Emannuel M. Josephson, though? He makes a pretty compelling case that THE oil family was far wealthier than any other family.

I really don't know... The Rothschilds have been at it much longer and the family has branched out. For example the Oppenheimers (De Beers) control diamonds. What I'm researching now shows bank accounts with unimaginable amounts of money (like $1,575 with 55 zeros!)