Questions... lots
The movie is really quite exceptional, but it's one of those films that every time I watch it... the same questions seem to arise.
1) Anne keeps referring to "that day her mother went mad" which sort of tells the audience she knows that they're all dead... but, she's just as shocked as Nicholas and her mother at the end of the film when the Old Lady asks them about Grace murdering them. She even insists "we're not dead" with the other two. But, she obviously remembers something, as she told her father "everything," as Charles says to Grace. Grace discusses the situation with Charles as if she also knows something happened, but they don't disclose what. What is it that they think happened, since they don't seem to realize that they're dead?
2) How long has Grace lived in this house exactly? I mean, she obviously never bothered to check out the graves or the names on them. If she had, she'd known something was up with Mrs. Mills, Lydia, and Mr. Tuttle. Not to mention, she stumbles upon the book of the dead hidden away in a room as if she'd never seen it before. You'd think that she'd have found the book earlier if they'd lived in the house for many years.
3) How long have Grace and the children been dead? Anne mentions to Mrs. Mills that the servants left and then "Mummy went mad," and Grace mentions that the servants left a week ago. Does this mean that the servants leaving her alone had pushed Grace over the edge, causing her to kill her kids and herself, and that they've only been dead for a week when Mrs. Mills shows up?
4) Have Mrs. Mills and the others been there the whole time, and Grace and the children can only now see them because they're also dead? Mrs. Mills and the others had died many years earlier, maybe they never left. Maybe once they knew Grace was dead... they pretended to just show up as "housekeepers" to try and ease her into the situation. Mrs. Mills even tells Grace at the end of the film that "there will be other intruders, sometimes we'll sense them, sometimes we won't." This indicates that they've been at the house since their deaths.
5) Does Grace's husband know he's dead? I know that this has been asked before, but I can never tell. I get the impression that he's "doomed," for lack of a better word, to stay on the battle ground where he died... only coming back long enough to say goodbye now that his family is also dead. Or, perhaps it's a cycle his spirit is trapped in, and he continues to make the trip from the battlefield back to his home... and the family can finally see him now that they're dead.