there are many jobless people. Your father's self esteem is very high, but because he has no job, his self respect and confidence is beaten down. He will naturally show the depressive signs. Nothing to worry. You must be able to distinguish between mental disease and mental disorder. Your problem is a mental disorder. Not a mental disease. These mental disorders are usually treated with a combination of medicines and other means like awareness, meditation
techniques, life style changes etc. I think two or three counseling sessions and psycho therapy techniques should solve your fathers problem. Let me know if your father is willing to undergo counseling sessions and tailor made psycho therapy through mobile. Take care.