Thank you for your query,
As your child is having recurrent coughing spells, the following things may be possible.
1. Allergic , which may get aggravated seasonally and may be recurrent
2. Asthmatic, which is due to broncho spam and it will be chronic and recurrent
3. Tonsils and adenoid
related, in this with infection and inflammation of tonsils and adenoid, cough
,throat pain and difficulty in swallowing will be there.
is less likely as there will be fever
, respiratory distress
and require antibiotics.
Consult your son regular Pediatrician
, and he will evaluate your grandson depending on his history and examination and will guide you accordingly.
Hope i have answered your query.