yes, that’s right.
Viewing post in In my Father's House are Many Rooms comments
If you have the family crest from the library wall, you can use it to enlarge the hole in the wall in the room on the same floor next to the locked room. You can use the hole to access the locked room. Moving the corpse in the room with the hole will cause a reaction that will lure grandfather out of the library. Thanks for playing and let know if there's anything else you need!