He is at risk of developing OCD or schizophrenia. OCD involves unwanted thoughts and fears that lead to repetitive actions, such as excessive cleaning or organizing. Schizophrenia is a mental disorder that distorts thoughts, feelings, and behavior, with symptoms like hearing voices or having delusions. Both conditions can be influenced by genetics and environment. OCD is typically treated with therapy and medications, while schizophrenia treatment often includes antipsychotic medications and therapy. It's important to encourage your brother to see his psychiatrist for a check-up and discuss the best treatment options for his symptoms.