Uncle Duck is the uncle of Daffy Duck. He only appeared in the episode Casa de Calma, when Bugs and Daffy accidentally went to the place where he lives. Daffy stated that he "never saw that man before", showing that he despises Uncle Duck for some reason, probably because he's so dizzy and annoying. He appeared once again at the end of the episode, when Bugs brang babyfied Daffy to his home for Uncle Duck to take care of him.
Uncle Duck with Daffy.