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, 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 all in the same household. He appears with the rest of the family during dinner giving Mario and Luigi a hard time concerning their Super Mario Bros. Plumbing commercial and their decision to leave a stable job with Spike, causing his wife to smack him in the head. When Mario hurtfully storms off after his father insensitively insults 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!")