yes he is eligible and it sounds like he may qualify for medicaid if your state is expanding its program. take a look at healthcare. gov to learn about options in your state. for personalized assistance check this page to find organizations working to help people get covered all around the country: <link>.
i have a special needs brother that lives in pa. he is 55 years old. he receives social security disability each month. he is not employed and his only source of income is his ss disability. i have durable and medical poa and can make medical decisions for him. will he be eligible for insurance on the exchange and possible help from the federal government and can i enroll him?