Claim: John D. Rockefeller has a brother named William.

William Avery Rockefeller , Jr. -LRB- May 31 , 1841 -- June 24 , 1922 -RRB- was an American businessman and financier . He was a co-founder of Standard Oil along with his older brother John Davison Rockefeller -LRB- 1839 -- 1937 -RRB- . He was also a prominent member of the Rockefeller family .