Miyamoto hints Peach–Rosalina sisterhood could shape future Mario games

TL;DR
Shigeru Miyamoto says the Super Mario Galaxy Movie's backstory—Peach and Rosalina being sisters—could become canon in future Mario games, as Nintendo hopes to expand character settings without being constrained by game design; exactly how it will be referenced remains to be seen.
- It Sounds Like Peach's Mario Galaxy Movie Backstory Will Be Canon In Future Games Nintendo Life
- Miyamoto wants to adhere to Peach's backstory in The Super Mario Galaxy Movie in future games Nintendo Everything
- Sounds Like Nintendo's Super Mario Galaxy Movie Backstory for Princess Peach is Now Video Game Canon, Too IGN
- Miyamoto hints that Peach and Rosalina's story in The Super Mario Galaxy Movie will be reflected in future games GoNintendo
- Miyamoto says he wants Peach’s origin story in The Super Mario Galaxy Movie to remain canon in future games Video Games Chronicle
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