Suggest Treatment For Psychosis And Paranoid Schizophrenia

Hi, I have 2 sons ages 27 and 23. The older was diagnosed with paranoid schizophrenia in 2009 and currently places himself in isolation because of fear of being killed. The younger is in college and is now experiencing psychosis (hearing a female voice who is commanding him to find his destiny so that he can change the identity of the people in the world). My relatives are trying to convince me that someone has cast evil spirits on them to make them crazy. They are upset with me that I do not believe and not praying hard enough to get the spirits off. What do you think?