Responses
So the actual sister died (it is kiera, right?), this woman (do u mean cosette?) is the demon who her mother (kiera's mother?? or who?) called on to protect her children (kiera and her lil bro?) from FL's mother(irony) (uh... kiera's mom??)
The demon (cosette?) distroyed the country in the past and the father begged the magician to help FL.

SOMEONE FEED ME SPOILERS PLEASE
I WANT SPOILERS
GIMME SPOILERS
I'LL GIVE YOU A COOKIE