Life MarioMario is mean sometimes to Luigi he Likes Pizza his Brother is Luigi
Meet the Wario Bros
In Meet the Wario Bros., Mario is playing hockey with luigi, but he accidentally knocks the ball out of the room.
In Cousin Malleo, Mario's cousin Malleo comes to visit, but his friends begin to like Malleo better then him. Then he gets jealous and eventually runs away, but Luigi finds him and then everything is better.