Yeah, Mario and Luigi's relationship should be the heart of any Mario Bros. movie that comes down the pipes (rather than some thin insta-love plot between Mario and Peach), and they should indeed be depicted as twins, rather than the older (and less unique) age-imbalanced version.Dr. Mario's Drunken Holiday Elixir said:I'd like during the movie, there's a lot of bro-to-bro interaction between Mario and Luigi. It should be emphasized that they're not just brothers but twin brothers. Yes, being a twin (who's identical), that makes a whole world of a difference. We don't have a lot of stories starring twin brothers(much less twin sisters)