Room Boundaries in Blood Ties
You should go by the definition in the rule book on page 8

Room - An area of the map tile that has a name and is separated from the other rooms by solid brown walls, doors, or the edge of the map tile. ...


Raise a Zombie in the graveyard: Only those in the Graveyard room.


Whenever a monster enters (or is placed) in an investigator's room (or vise versa), the investigator must immediately make an attribute test called a HORROR TEST. ... If multiple investigators are in the room, the must each make a horror test.


Elder Sign: although poorly worded (the Elder Sign rules text), all monsters in the room are moved two spaces away from her. (Keep in mind that a map tile may have as many as 3 rooms on it, you cannot use the terms interchangeably)


Tile - A single piece of punchboard that contains between one and three rooms.
Elder Sign - &quot;Pass: The keeper must move each monster in your room 2 spaces away from you.&quot;