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I am going to invite my parents for two months, both of them they are retired primary teachers. While filling visa form ,in work category I have mention retired for my Dad. But Still my father work as secretary for all pensioners club ( as voluntary work, No Salary) ,Can he mention that to the visa counselor . just to show that he is in working and to assure that,they are going to return back to their home country after their US trip. They are already going to show their pension and their property thought.