Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In the movie, "Dream House", it's revealed that: Will Atenton is actually Peter Ward. And that he had been in the Greenhaven Psycological Hospital for a long time and then discharged. When was Peter in Greenhaven and why? And why was he considered "nuts"?
When did Peter/Will go to Greenhaven?