I guess so because Wario is not friends with Luigi. Wario must be best friends with Waluigi like Mario and Luigi are best friends and bros. So Wario and Waluigi must be best friends and bros.
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No. Mario and Luigi are brothers, and Waluigi and Wario are brothers. Wario and Mario; and Luigi and Waluigi are no related in any way. they are only rivals.
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.
You must have unlocked Luigi in order to unlock Wario. You must return to the mirror room as Luigi. There are three flowers present you must turn invisible and jump into the Wario painting.
Wario and Waluigi are brothers. They're the evil opposites of Mario and Luigi.
You flip the m in mario up side down to make it wario and you just add a wa to luigi for waluigi.