Rockefeller family
Only the expurgated records of deceased family members are publicly available to scholars and researchers. All records pertaining to living members are closed to historians. However, as Nelson Rockefeller's researcher, Cary Reich, discovered, in the case of Nelson's voluminous  of papers, only about one-third of these files had been processed and released to researchers up to 1996. He reports that it will be many years before all the papers will be open to the public, despite Nelson having died in 1979.