Good movie. Fun to watch. I have just two issues with it.
1. If the ghosts can communicate with the kid, why not just tell him what the problem is. Here one of the parents is pretty ready to listen.
2. If the wife knew what the issue was (as told by the policeman) why not tell the same to her husband. Things would have been clearer.
The director thought all these subplots will be fun while the main protagonist toils on and on. It is a movie about just him. Rest are just smokescreens.