Hi, I do appreciate your concern for your friend s brother. However, it would have been better had you provided details of his symptoms. That would have allowed me to help you in a better way. Schizophrenia is a condition in which a person starts having symptoms in which he might hear voices or visualise things which others are not able to. He may also become suspicious and start to have doubts that others are trying to harm him or are talking about him. He may become irritable or aggressive and may show emotional disconnect with the rest of the people. usually it starts in the 20s but many cases start showing symptoms even as early as 10 years. OCD (Obsessive Compulsive Disorder) is a condition in which a person will have repeated thoughts like doubts or fear of harm or regarding contamination and an urge to do things repeatedly in response to the thoughts like checking, cleaning or praying, etc. In your friend s brother s case, I would suggest that you seek a psychiatric consultation for detailed evaluation of his condition and then initiate treatmet accordingly. Hope the above information was helpful. Best wishes.