JKSManga
HERE is my theory. The 8th and 2nd family leaders are the ones who betrayed the vampires and worked with the Bloodsuckers. Why ? By reading people mind , it pinpoint all vampires location and thus, avoided detection when going to the Bloodsuckers settlement. 2 : Bloodsuckers needs an insane amount of Blood to live but no one ever notice something suspicious in any family blood consumption. Which indicate that a leader is definitely involve and that it could cover it's tracks. To me ITS the 2nd family ability which revert the bloodsacks to a prior and primer state post consumption.