I'm not sure if it's changed since I've seen it, but I believe it's Charles Martinet, the same guy who voices Mario.
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Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi Luigi and Luigi.
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.
Luigi lives in a Mansion and Mario lives in a House
Mario and Luigi are from Italy
Well Mario and luigi are brothers but I know Luigi looks taller but Mario was born first and luigi was born second so mario was the first to be made.