Robert William Unser was an American automobile racer. At his induction into the Motorsports Hall of Fame of America in 1994, he had the fourth most IndyCar Series wins at 35. Unser won the 1968 and 1974 United States Automobile Club (USAC) national championships. He won the Pikes Peak International Hill Climb overall title 10 times.

Alfred Unser was an American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser Jr. He was the second of four men to have won the Indianapolis 500 four times, the fourth of five to have won the race in consecutive years, and the winner of the National Championship in 1970, 1983, and 1985. The Unser family has won the Indy 500 a record nine times. He was the only person to have both a sibling (Bobby) and child as fellow Indy 500 winners. Al's nephews Johnny and Robby Unser have also competed in that race. In 1971, he became the only driver to date to win the race on his birthday.