Goofy's family

[ScroogerelloBassottoMessaggi: 11Esordiente Registrato]

Hi, all!

On the Italian wikipedia page for Goofy (https://it.wikipedia.org/wiki/Pippo), the following caught my attention in the list of Goofy relatives the page showed:

Pappo, fratello gemello
Pippanda, sorella maggiore

Now, if I'm not mistaken, this means that Goofy has a (twin) brother called "Pappo" and an older sister (sorella maggiore = older sister, right?) named "Pippanda". Is this true? If so, does anyone here know which stories Goofy's brother and sister appear in? Many thanks in advance! 

Scroogerello

[Kim Don-LingDiabolico VendicatoreModeratoreMessaggi: 1.600 Registrato]

Hi,
Pappo is the twin brother of Pippo (Goofy) in a very famous adventure written by Romano Scarpa, Topolino e il Pippotarzan (https://coa.inducks.org/story.php?c=I+TL++158-AP). He appeared only one time.

[ScroogerelloBassottoMessaggi: 11Esordiente Registrato]

Thanks! 
Now, on a similar note--does anyone happen to recognize the character called "Grandpa McDing'h" on the tree below (made by a certain Adrien Miqueu)? The art style looks like Floyd Gottfredson's (perhaps Romano Scarpa's?) style, but I can't find the story from which he is. I did read that Goofy's grandfather appeared by the name of "Walter De Pippis" in a recent Topolino issue, but I don't think he's the same character as the one on the tree.
http://a142.idata.over-blog.com/3/25/34/16/Goofy-s-family-tree-mail-copie.jpg

[La Spia PoetaVisir di PapatoaMessaggi: 2.307 Posizione: Disperso fra i mari inusitani Registrato]

He isn't Walter De' Pippis, indeed. I think it's from a story by Paul Murry, but I don't know anything.