cousin's because they don't see theythother so much
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There is no official answer, honestly. All we know is they are Mario and Luigi's "evil counterparts." well Mario and luigi are cousins and waluigi and luigi are brothers Mario and Luigi are brothers... and I highly doubt that Wario and Waluigi are cousins with Mario and Luigi.
In the original you can play as Mario and Luigi. In New Super Mario Bros DS you can play as MArio AND LUIGI. IN NEW SUPER MARIO BROS WII ITS MARIO, LUIGI, BLUE TOAD, AND YELLOW TOAD.
Luigi isn't in Donkey Kong and wasn't until Mario Bros. so Mario is older Mario-29 Luigi-27
There are only two Mario Bros., Mario and Luigi. There are also their "opposites," Wario and Waliugi, sometimes called the Wario or Wicked Bros.
Luigi's counterpart in Super Mario Bros is his brother Mario.However, he has an "evil" opposite Waluigi (bad Luigi) who first appeared in the game Mario Tennis(2000). He appears mostly in spinoffs starring Wario.