What movie am I trying to think of?

Ok i only remember parts of this movie and ive been trying to figure out what movie it is. There is a white mother with a japanese son, and i think a japanese husband. They move to japan and the son gets really sick. There is something about the celebration of the dead festival, and a guy that works in an herb shop that turns out to be a ghost. There is a point in the movie where the mom has to do some kind of ritual to where she can enter the world of the dead to enter a certain room of the house. The point of the movie is that the grandfather or someone was smuggling drugs in coffins and a maid found out and he killed her and she is the one haunting the boy. Its kinna driving me crazy trying to think of it so if you have ANY IDEAS please answer!!!!!!