Mystics come to Hogwarts

Harry Potter - J. K. Rowling
F/F
F/M
M/M
G
Mystics come to Hogwarts
Summary
James Potter had an older sister that no one remembers about until her children start attending Hogwarts. How will Magical Britain react when they learn who their precious 'Savoir' grew up around and with. Will everyone survive or will the Preda family burn Magical Britain to the ground and reform it?
Note
Anything not in English will be translated at the end in the notes. I used Google Translate so if anyone that reads this speaks Romanian I apologize if I butchered your language.

Chapters