Everyone in their clan and community knew about Ivan and how he lived in the human world because he was one of them too.
The Carter family, being the head of the clan, attracted many enemies who wanted to clear their families existence but it was never easy as each member of the Carter family were stronger than other bloodlines. But since Ivan was a human, it made him vulnerable and also the most targeted member of the family.
While Ivan stayed with them, it was easy to protect him but once he moved out, things became difficult.
Though their powers were intact in the human world as well, there was a limit to how they could use them as it wasn't their land. Anything too extreme would blow up their cover and attract human attention which they did not want. This is why while protecting Ivan, they had to be very careful which made things a bit difficult.
"I don't want to take any risk which would end up hurting him, I—"
