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Nature and nurture seem to play a role in these families' athletic success.
Former Daytona 500 champion Dale Earnhardt Sr. looks on from the top of his hauler as he prepares to drive in 2000, the year before he died of a skull fracture in a crash at Daytona International Speedway. His nickname: The Intimidator.
For more stories about famous families, read:
Steve Jobs and His Dad and Other Famous Estrangements: Part One
Famous Estrangements: Part Two
Sister Acts: Pippa and Kate Middleton, Serena and Venus Williams, and Others
Famous Brothers: These Male Siblings Sing, Act, and Play Football
Adopted Celebrities
Longest Celebrity Marriages
Shortest Celebrity Marriages
Fathers After 50: Michael Douglas and Others
Dowdy Grandmas? No Way. Check Out Today's Glam-mas!
Family Dynasty Report