Someone please explain

Rating: 10/10 (23 April 2006)

Don't get me wrong i really enjoyed the movie. I am a silent hill buff..played all the video games. Yes, this movie was sorta like the game...sorta fell with the same story line with some subtle differences. But please tell me this.....
What did the end of the movie mean?
Was Rose and Sharon dead?...if so when did they die?...the car accident??...
Then when why did the husband/dad Christopher went to silent hill he was seeing it in a differ view....sunshine then rain...no ash...no nothing....
This totally lost me...So someone please explain it!