I just started reading 'Titan: The Life of John D. Rockefeller Sr.' by Ron Chernaw it's about the baron of Standard Oil from birth to death. His father "Devil Bill" was a patent medicine flimflam man and at one point in time "Devil Bill" lived with his wife and housekeeper(his side piece) and he fathered 4 children between the two of them in a 2 year span

John D. was apparently a cool customer never really emotive, more of an automaton than a human but there was one person who could make him get his hackles up and that was muckraker IDA TARBELL