What nationality was Marion Rockefeller Weber's paternal great-grandfather?
Marion Rockefeller Weber:  Her paternal great-grandfather is Standard Oil's founder John D. Rockefeller and maternal great-grandfather is Frederick Billings, a president of Northern Pacific Railway. John D. Rockefeller: John Davison Rockefeller Sr. (July 8, 1839 – May 23, 1937) was an American oil industry business magnate and philanthropist.
American