You are welcome!
I'm sorry for your brother.
When acid reflux into the larynx and throat, causes many different symptoms like laryngitis, hoarseness, sensation of a lump in the throat, post-nasal drip, chronic throat clearing, excessive throat mucous, sore throat, spasm of the throat, throat pain and coughing.
If the acid refluxes into the lungs, chronic cough and pulmonary conditions can result, such as pneumonia or bronchitis.
Try to get him regular check ups.
Best wishes!
Marija