The Stewarts, The Others
The Others is indeed a scary movie, but the family it introduces us to has a similar problem as the Maitlands. They suspect that their house is haunted, but they don’t realize they’re the ghosts in the equation, and it takes the entire movie for them (and most members of the audience) to figure it out. The same doesn’t go for the family’s live-in domestic workers, who are also ghosts but are fully aware of that fact, though they creepily keep that information to themselves.