I think Mario should be Han, and have your favorite Koopaling as Luke. It'd make more sense than Bowser being Mario's father.
I saw a Star Wars parody in Newgrounds that involved VG characters. This is how I remember the casting.
Mario
SW character: Vader
Story character's name: Darth Mario
Luigi
SW character: Luke
Story character's name: Lukeegi Pipewalker
Zelda
SW character: Leia
Story character's name: Princess Zeia
Donkey Kong
SW character: Chewbacca
Story character's name: (can't remember)
Conker (from Conker's Bad Fur Day)
SW character: Han
Story character's name: Conk Solo
Shinobi dude
SW character: Obi Wan
Story character's name: Obi Wan Shinobi
Mario and Luigi are still brothers in this, but Mario went to the Dark Side of the Force Feedback, and is after game cheats and plans for the Game Cube in his X-Box ship. Oh, and the escape pod for this Game Boy space ship was a GB cartridge!