Looking for a horror movie (possibly produced/distributed by Arthouse) in which a family stayed in a house and one by one entered a room where I think they might have died. In the end, it turns out that it was all in his head.
It was made between 2000-2010. There was a family of 4 people, 2 parents and their adult children. The movie starts out with them eating and arguing a lot, then some unexplained events start to happen.