|Baby Brother (duck)|
|Relatives:||Flapjack (fake brother)|
|Introduced in:||"Oh Brother"|
In the episode, "Oh Brother", Flapjack discovers a duck, mistakening it for a baby with missing body parts. Flapjack then steals K'nuckle's body parts in order to place them on the duck. As a result, Flapjack treats the animal as a little baby brother, serving as a big brother role.
In the end, "Baby Brother" leaves Flapjack, flying away with his flock.