Floyd Mayweather Sr. and Floyd Mayweather Jr.
The relationship between this father-son boxing duo has been a seesaw battle of success, fame, and fallout. Mayweather Sr. became his son’s trainer prior to his 14th professional bout. Junior fired his father as manager and trainer when their differences came to a head. There was little public conflict until Senior announced his plans to train Oscar De La Hoya opposite his son in the biggest fight of his career. (AP Photo/Eric Risberg)