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Nature and nurture seem to play a role in these families' athletic success.
Despite his dad's death in a NASCAR car crash, Dale Earnhardt Jr. continues in the family business. Here the popular champion grabs his helmet before a Nov. 11 race at the Phoenix International Raceway.
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