Severe RTA. Had Cornea Transplantation, Hip Replacement. Received Antidepressant. Underwent Subdural Haematoma. Done CT Scan. Advice

Hi my father is 80 years old he had severe RTA 4years ago there were bleeding in his head ( frontal lobes and ventricles ) and underwent subdural haematoma evacuation , then he other operation cornea tranplantation which is rejected and total hip replacement ,because of his many illness he got depressed and recieved anti depressent serrotonin reuptake inhibitor 100 mg , now he is so aggrresive with his family members he has wrong thougth talkative have unappropriate decisions , he thinks his family is his enemy , the CT scan showed hypodense areas at the frontal lobe mainly at the left side , how can his symptoms be managed , oleanz 5 mg is prescribed for him does it work ?please what is your advice am his care giver and my life became very difficult with his abnormal behaviour