Beatrice of the Ioluf tribe received a letter of admission from Hogwarts when she was eleven years old.
Beatrice looked confused: I can actually do magic. This is really a shocking thing. I must weave it into Hibiori, and by the way, I have to tell other friends.
Other friends: There are people among us who can do magic. This is incredible. I want to tell my parents.
Parents of other friends: I want to tell the patriarch that we have a magician.
So the whole clan knew that Beatrice was going to Hogwarts.
Concept: An immortal will become more powerful after learning magic