What is this article mainly about? A. Mario Andretti and his son, Michael, were the first set of father-son opponents ever in IndyCar history. B. Mario Andretti and his twin brother Aldo were born during wartime in 1940 and lived in a part of Italy that later became part of Yugoslavia. C. Mario Andretti made millions of dollars, was placed in four Halls of Fame, and is believed by many to be the best racecar driver of all time. D. Mario Andretti has written three autobiographies and has been the subject of eight books written by other authors.