Since you have mentioned that the cough is chronic and non-responsive to medicines, it is best that your father get some basic diagnostic tests like:
1.
Complete Blood Count (CBC)
2. Chest X-ray: This can help identify lung abnormalities, such as pneumonia, bronchitis, or tumours.
3. Sputum Culture: To analyze the material that is coughed up to identify any bacteria, viruses, or fungi causing respiratory infections.
4. Pulmonary Function Tests (PFTs): These tests measure lung function and can help diagnose conditions like asthma or chronic obstructive pulmonary disease (COPD).
5. Allergy Tests: To identify any allergic triggers that may contribute to chronic cough.
6. CT Scan of the Chest: Provides more detailed images than a chest X-ray and can help detect structural abnormalities or conditions like lung cancer.
Next Steps
I can assess his case and, as a first step, recommend the necessary diagnostic tests after gathering information about his symptoms and medical history. After we get the results, I'll come up with a homoeopathic plan to help him out.
Health Tips
General tips for chronic cough relief are staying hydrated with water, using a humidifier to add moisture, avoiding irritants like smoke, trying honey and warm water, gargling with salt water, elevating your head while sleeping and being mindful of trigger foods. Steam inhalation can also provide relief.