There has been a lot of speculation over the years about how Mario, Luigi, Wario, and Waluigi are related. Mario and Luigi are brothers, as evidenced by their shared last name and Luigi's introduction in Mario Bros. Wario is not related to Mario and Luigi and was originally created as a childhood acquaintance and villain in Mario Land 2.

Mario, Luigi, Wario, and Waluigi - Nintendo's premier platforming franchise characters who all share a similar fashion sense and naming convention. While Luigi joined Mario on his first exploits before striking out on his own ghost-hunting ventures, Wario was one of Mario's first rivals right alongside Bowser, and Waluigi showed up when Wario needed a tennis partner. For someone who first picked up the Super Mario series on the Nintendo Switch, the familial relations between these similar-looking characters may be unclear, but the answers are quite straightforward.

As far as Nintendo's original pair of protagonists go,...