Hello, Thanks for the query to H.C.M. Forum. Sometimes doctors can t do anything except helplessness . In your grand son case same thing is there. When any person gulp anything it enter into eosophagus (food pipe ) and enter into stomach. When we inhale air it enter into larynx from pharynx and from larynx to lungs. This is the way . In cerebral palsy patient is not able to raise his esophagus above the level of larynx and this food or fluid enter into larynx and this develops cough or chocking sensation. Here I want to say that there is also palsy of esophagus ( oropharynx portion ) so food don t enter into food pipe. This is the reason of cough and chocking sensation. In my opinion consult a plastic surgeon and reconstructive surgery of esophagus is the only an option. Good luck. Dr. HET