There's a simple and easy way. Buy a LOT of Cannonballers and battle him. All you have to do is destroying eggs. After you free 5 Yoshis, they will push the Chomp Rock on him. He will then fall on his back and lose his defense. Always, when he's lying, use Cannonballers on him. This way, it's a piece of cake to defeat him.
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Mario and Luigi
In Yoshi's Island they do, but their parents are never shown.
They were born from the same parents. ;)
None of Mario's parents were ever revealed, but you can see shillouettes of Mario & luigi's parents after defeating the final boss in Yoshi's island SNES or for Gameboy advance.
Mario and Luigi are twins, but Mario is older.
luigi and Mario . luigi and Mario . lugi and Mario.
Yes its 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.
Mario and Luigi are from Italy
Luigi is Mario's younger but taller brother.
You can only do it with Mario and Luigi. For Mario, press A. For Luigi, press B.