The Willie Brothers (Phil, Gill, and Bill Willie) are the bumbling nephews of the notorious cattle rustler Alameda Slim. Although they aren't really evil so much as running with the wrong crowd, they assist Slim in his schemes in Disney Heroes vs Villains.
Disney Villains War
The Willie Brothers, appear briefly in this war, helping their uncle to retrieve a musical instrument, so that it would hypnotize the snake, Kaa. He later succeeds as he throws his spurs at Kaa, knocking him out. The Willie Brothers didn't appear afterwards, since Slim is later a victim to the Black God, Chernabog.