Beginning on August 30, 2017, the Wacky Wario Bros began to appear on TheAwesomeMario, albeit as short, two-minute videos. There are only three episodes. No more are being created after TheAwesomeMario became inactive again.
According to the title of the series, Wario and Waluigi are brothers in SMG4's canonity. It's unknown if they're really brothers in the real Mario series of Nintendo because there are a lot of different sources about their relationship.
According to Charles Martinet (voice actor for Mario, Luigi, Wario and Waluigi), Wario and Waluigi are "two nice, evil guys who found each other". Other sources also state that they are cousins, siblings, or simply stating that the relationship is unclear. In Mario Super Sluggers, however, Wario has called Waluigi his “traitor friend”.
The Wario Bros. rarely have subtitle lines in this series.