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Ready for a Sibling Showdown? Take this fun and free online this or that siblings quiz and pick your faves! In Nickelodeon's Sibling Showdown, you get to cast your vote and decide between your favourite set of siblings. Which brother and sister pair do you prefer, Phoebe and Max or Billy and Nora? Who would you rather battle mutants with, Raph or Donnie? Play Nickelodeon: Sibling Showdown and other free online quizzes and games now at Nick.co.uk and nicktoons.co.uk. How to Play: Use the mouse to select answers.