All of these have already happened, but the returning to Yukon and finding long lost relatives has happened the least. But the story "Letter From Home" alreadt closes that chapter well enough.

Although I would be interested what's going on with Donald's mother and how she would take meeting her brother, but I don't think Disney would allow writing that story since it has some deeply rooted parental issues. I mean even for side characters it never brings to picture the character's parents. They're always aunts or uncles, nieces and nephews. I mean, what the hell is up with that??

Anyway, because the Letter From Home is closure enough for his family matters, I'd love to see him return to Yukon for good, to be with Goldie.