1. It would be greatly beneficial that your dad starts taking walks. Half an hour in the morning and evening at dusk is ideal.

 2. Tell him to do yoga pranayam. Especially do slow kapalbhaati and anulom vilom. Do for 10 minutes each.

 3. Take a homeopathic remedy after proper mental and physical case analysis.

 4. Some remedies like nux vomica, belladonna, phosphorus, sulphur, merc

sol, stramonium, Lachesis, lycopodium are very useful.