Mario and Luigi's grandfather

A grandfather of Mario and Luigi, appearing in The Super Mario Bros. Movie, is shown as a member of their family during a dinner gathering.

The Super Mario Bros. Movie
In The Super Mario Bros. Movie, the grandfather is shown living with Mama Mario, requiring her help to feed him. He wears an old fashion hat and a plaid shirt. He appears with the Uncle Arthur and Uncle Tony during dinner, laughing at Mario and Luigi about their Super Mario Bros. Plumbing commercial. In his younger years, its implied that he used to be a boxer.