26. The Spinks
The Spinks family is legendary in the boxing world. First of all, Michael held the light-heavyweight title from 1983-85 and the lineal heavyweight title from 1985-88. Younger brother Leon also had great success as an amateur, winning multiple championships. But in his career as a professional, he stunned the world by knocking out Muhammad Ali.

That achievement alone is enough to live off for the rest of your life. Leon’s son Cory was also a very impressive professional in his own right. He was an undisputed welterweight champion from 2003-05. Then, he went on to become a two-division champion, winning the IBF Junior Middleweight title. You don’t want to mess with this family.