[@Holy Soldier]

Yes, as stated in the OOC, the Demi-Gods may be aware of supernatural abilities (it is up to you as the writer to decide whether that is the case or not); however, whether they come to the conclusion of divine intervention or not, there will be no proof. Their parent won't pop up all of a sudden to tell them how awesome immortality is or whatever, nor will their mortal parent be aware of it. God shows up, does the deed, leaves mortal with baby.