Uncle Arthur

Uncle Arthur is a minor character in The Super Mario Bros. Movie, portrayed by John DiMaggio. He is a member of Mario and Luigi's family, being the brother of Mario and Luigi's father and the husband of Aunt Marie. He closely resembles Luigi, but with a longer chin, and is depicted as sporting a light brown colored flannel.

The Super Mario Bros. Movie
Uncle Arthur is introduced early in The Super Mario Bros. Movie, being shown living with Papa Mario, Mama Mario, Uncle Tony, Aunt Marie, Mario, Luigi, their grandfather and niece. During the dinner conversation, he sarcastically quips about them deserving an Oscar for worst actor for the Super Mario Bros. Plumbing commercial, causing his wife to smack him in the head. When Mario tries to continue the conversation by asking if his family saw the commercial, he and Tony ridicule them for quitting their day job for it. When Mario hurtfully storms off after his father insensitively berates him, Uncle Arthur, along with the rest of the family, gives the father disapproving looks.

Quotes

 * "They give an Oscar for worst actors?" (His wife smacks his head) "Hey, what'd I do?!"
 * "You shouldn't quit your day job." (laughs after Uncle Tony replies with "Oops, you already did!")