Despite you putting down the Valor family ghosts, the reports of attacks have not ceased. It was a good gamble, but perhaps we did not settle their unfinished business after all. From my research, it sounds like this family all went missing at the same time. Whatever trauma caused their spirits to be chained to this realm must have happened all at once. Our only clue is where you found the book. Return to Raven Hill and see what you can find. Maybe bringing their weapons will spark something.