Doubts

[Mickey]

Sometimes I decide to solve some doubts of mine... for your misfortune! I
hope you'll be able to answer.
a) Where/when has it been the first comic rendez-vous between Mickey Mouse
and Pete Leg? And is the latter really legless, at least in the first
classical appeareances?
b) Why is Duckburg named so if it's been founded by a Coot?
c) Excluding Don Rosa's work, who said that HDL are children of Donald's
*sister*? (The first appearance, you know, talked about a cousin)
Thanks and bye

Mickey