my father he is 65. he worked as a technecian and retired from his job in 2006. Now i’m going tell you about his problem.he always be afraid and think somebody wanna kill him.he lend money to the thousands of people and people will pay him.but the truth is he never lend money to the people.he always said this word again again.i always try to make him understand but he skip me.at first we saw these symtom after his retirement from job.without this symtom he is a good men,he still lookafter our family and known as a gentleman in our society. sometime i misbehave with him and feel pain for my father. My question is it totally cureable?what type of treatment is needed.