Nah, my response wasn't about him bluffing. I just thought there was a possibility that he may only know that, say, Vermouth and Anokata are family members... in other words, it may be that he doesn't know if they were siblings or parent and child—he would just know that they're family. But you'll notice I put "may" in italics—the reason is, there's a higher chance that he knows the whole thing. If he does know the whole thing, then him eventually telling someone, in a file—thus telling us—is very much an anticipated ting.