They seem safe

The Father pauses to think for just a second before nodding, "I see, very well".

He holds up the silver letter opener, letting you see it in the dim light of the house before holding it to his neck, "As I said, the wolf beasts are very allergic to the metal and the purity it represents. When you touch one of the werewolves with any silver it'll bubble and boil".

There appears to be no change to the Father's skin. He seems satisfied that he's proven himself to you and lowers the stubby, blunt blade.

Next he turns to go after the shotgun wielding young man. He retreats briefly back into the shadows and tugs on the other's arm. For a second there's the suggestion that the silent man will resist, there's the hint of tension between the two, but it doesn't last. The Father presses the silver letter opener to the cheek of the other man and there's no reaction.

"Now," he says, beckoning you to come closer and further into the house. "Your turn."