So your world's kind purposefully changed themselves?
In my world the Original family were the ones who created the word or they at least co-opted it and then twisted it for their own benefit. I know they helped spread a lot of false rumors about what actually hurts vampires. The first family was created by their mother who wanted to like protect her family from the werewolves, since some of them had killed her youngest child. I don't think she expected some of the things that came with the immortality she granted them.