Career: MLB All-Star
Famous Family: MLB outfielder Ken Griffey Sr. (father)
Being the kid in Little League whose dad is a major leaguer probably isn't the easiest gig. But Junior lived up to his father's talents on the field—and then some. The 13-time All-Star played in the bigs for more than 20 years, and is still one of the most legendary home run hitters in the history of the game (with a total of 630).
Last month, the Seattle Mariners—for whom he played for 11 years and is still a consultant—announced that he's being inducted into the team's Hall of Fame.