Gus Goose is Donald Duck's second cousin, and the great-nephew of Grandma Duck.
Gus's main personality trait is being quite gluttonous, as Donald discovered the hard way when Gus came for a visit in Gus' first appearance, the 1939 animated short Donald's Cousin Gus.
Within the Disney comics, Gus is usually shown as living on Grandma Duck's farm outside of Duckburg, where he works as her farmhand. Along with his gluttony, Gus is shown in the comics as being quite lazy, often doing little if any work on Grandma's farm.