Is treatment was OK or any wrong step.

My father died 1 week ago by non resolving Pneumonia and Sepsis. My father had admitted hospital before for LRTI one year ago. 2 months ago my father had cough and slight fever and chest creps. I checked to MD doctor. He prescribed oral antibiotic for 10 days. He said he needs to be hospitalisation. But I took my father to a pulmonologist. He prescribed antibiotics, steroids and nebulizer and give him HRCT thorax. After 10 days of medication he was not symptomatically improved and his HRCT Thorax report says ground glass opacity and mild bilateral centrilobular emphysema. After 10 days I visited to the doctor and doctor said my father needs better treatment in better multi-speciality hospital. I visited multi speciality hospital OPD and said pulmonologist to admit hospital. He gave him antibiotics steroids and nebulizer. When his WBC 19000 and CRP 260 . After I admitted my father in a local hospital. Doctor gave him oxygen, meropenom inj ,tigicycline 50. but died after 5 days by sepsis