It has to do with light. I have a "light" and all. Mine's more limited, not being full fairy. It blasts people, broke a witch's curse on someone, it does a lot of things, not all which I understand or know how to do.
It was a lot longer ago than that. My "grandfather"'s I don't know how many generations back. But it's been in my family a long long time. I don't know I'm the best person to answer all those questions, but I'm about all you got for them.