Why are so many people surprised to learn that Mario and Luigi are twins? - Quora

What is the secret of the success of Super Mario? - Quora

I Literally Just Learned Five Seconds Ago That Mario And Luigi Are Twins

What's the relationship between Mario, Luigi, Wario, and Waluigi? - Quora

Who are Wario and Waluigi, and how are they related to Mario and Luigi? - Quora

Why are so many people surprised to learn that Mario and Luigi are twins? - Quora

What's the relationship between Mario, Luigi, Wario, and Waluigi? - Quora

Why are so many people surprised to learn that Mario and Luigi are twins? - Quora

What are some of the most interesting identical twins' stories you have heard? - Quora

Wario and Waluigi are supposed to be the Mario Bros.' evil doppelgangers. How come they weren't introduced at the same time? - Quora

Why are so many people surprised to learn that Mario and Luigi are twins? - Quora

As a Mario fan, what are your thoughts on the casting choices for the new Super Mario movie from Illumination Pictures? - Quora

What is the evidence that Luigi is not the younger brother of Mario, but actually older than him? - Quora