It looks like the younger sister is either a reincarnation of the "child of the demon" or at least heavenly influenced by it, because just like in the fairytale she covets what isn't hers without ever being satisfied. And just like in the fairytale she won't ever be able to use any kind of magic.
The mother seems to somehow grasp what's going on, but she is much too worn out to bother to interfere.
Finally, the father is only interested in the money and fame that would come his way for being the saint's father. Otherwise, he doesn't seem to care about his family at all. And just like the younger daughter he seems to be incapable of listening to others, even if his life depended on that. He and his youngest daughter are probably the only ones who don't know, that you can't use magic with a stolen blessing.
It looks like the younger sister is either a reincarnation of the "child of the demon" or at least heavenly influenced by it, because just like in the fairytale she covets what isn't hers without ever being satisfied. And just like in the fairytale she won't ever be able to use any kind of magic.
The mother seems to somehow grasp what's going on, but she is much too worn out to bother to interfere.
Finally, the father is only interested in the money and fame that would come his way for being the saint's father. Otherwise, he doesn't seem to care about his family at all.
And just like the younger daughter he seems to be incapable of listening to others, even if his life depended on that. He and his youngest daughter are probably the only ones who don't know, that you can't use magic with a stolen blessing.