This is really a legal question and depends on location of residence but in general, power of attorney should not supersede patient confidentiality. However, your brother may have authorized his psychiatrist to disclose mental health care and treatment information to your father. That might be why your father seemingly has so much control over your brother’s care. Beyond these generalities, you’ll have to consult a lawyer.
It’s advisable to contact an attorney who specializes in mental health law. He or she would be in the best position to answer your questions.
Each state has their own laws regarding psychiatric powers. A good place to start would be contacting your state’s National Alliance on Mental Illness (NAMI). They might have information on their website that would prove useful or they might refer you to a good lawyer.
Another good resource is the National Disability Rights Network (NDRN). According to their website, they are a nonprofit organization for the federally mandated Protection and Advocacy (P&A) Systems and Client Assistance Programs (CAP). There is a P&A/CAP agency in every state. You can learn more information about their services on their website. Please take care.
Dr. Kristina Randle