Franz struggles to remember relationships and story events during gameplay

My campaign spans over roughly 8 hours of playtime. During this Franz lost track of the relationship of characters, major story events and where characters were hanging around. Even when I reminded him multiple times, he could not piece it back together. He also lost track of a lot of characters that were important to the story - namely major villains.
He mentioned NPC’s and places that did not exist and threw me into that part of the story with further unravelled the flow.