Morty and Ferdy have only been in one animated short ever, and it was before Huey, Duey and Louie came out...
You can check here: http://stp.ling.uu.se/~starback/dcml/chars/ to see if they were all in a comic together.
Donald's sister has never been shown in any episode but she sent him a post card telling him his nephews were coming to visit. Her name is Dumbella
"What ARRRRGH you doing?"
"What are you doing?"
"No, What ARRRRGH you doing?"Cap'n Jack lives again!"I'll try anything once or twice, that's the kind of mouse I am"
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