But before I can tell you, you may want to watch these two videos.
https://www.youtube.com/watch?v=-JcK_Bfe3sw
https://www.youtube.com/watch?v=xzWFuEH9HsA
I'm just going to remind you again, I DID NOT MAKE THESE VIDEOS!
So, my theory, which is 2 worlds colliding type of theory.
Rosalina's parents could be Peach and Link, not Luigi and Peach.
Before you say ANYTHING, hear me out.
Link's Ears are 'little ds' (you should know what this means from the video above)
He has blue eyes in all of the realistic Legend of Zelda games. (again, realistic, not including 8-bit or toon link)
He also has blonde(or brownish) hair it basically all the games.
Link has a telescope
Link ALWAYS WEARS GREEN(green hat, green skirt...or tunic)
Like shown in Rosalina's book.
In most of the games, Link is tall.
And of course, Link is the rare left-handed hero.
Now I must tell you, that Peach + Luigi is MUCH more likely than Peach + Link.
And, Link doesn't have a moustache! Yes, Link could have grown one, but it said it was 'her father's pride' in the video, so it's still more likely that it would be Luigi.
So, this is my theory, and please comment and like this blog if you found this somewhat interesting!
Until next time,
-Theorizing Nerd