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Nature and nurture seem to play a role in these families' athletic success.
Indiana Colts quarterback Peyton Manning – the winner of four National Football League MVP awards and Eli Manning's big brother — looks on from the sideline during the Nov. 6 game against the Atlanta Falcons. He is recovering from neck surgery.
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