Schrezophenia. My father. please help.

My father thinks that about 500 people surrounded him from every side.. They're using some ray machine.The ray always creating pain throughout his body He whole night walk around our village to catch those people. Also he thinks some Villagers helping those culprits.He has already done some court case against villagers.I dismissed the case. He normally does all house jobs like shopping,looking after farming, perfectly. Problem is that he doesn't want to see doctors.I have already consulted with some doctors,but their medication did not work well.We constantly in depression for our father. He is becoming week slowly. I want to cure my father what it takes.Please need suggestion what should I do. I have heard about NIMHANS in Bangalore.Is that right place to take my father.Please help.