I am sorry to note the state of your father's health.COPD
is a progressive disease, and is chacterized by air trapping with formation of bullae. If they are close to the lining of the lung, sudden chest movements like forced sneezing
can cause bullae to break and subsequent pneumothorax
that will need urgent treatment.
He needs to go to a tertiary Chest Centre with HDU support and institutions of choice with good services will include CMC Vellore (4 hrs from Chennai), or AIIMS New Delhi.
There are other Chest Centres like VP Institute of Chest Sciences, Delhi as well. Please contact the centre and arrange an admission before taking him there.