I don’t appear to be communicating effectively to you.
I read all you wrote and understand it quite well.
Epilepsy has nothing to do with the perceptions described by the father and the son.
It is an entirely different category of thing.
My last reply on this. You do a dangerous act by encouraging the parents not too also seek medical attention by calling it a waste of money. That is a huge red flag for me. See a docor and see a preacher as well. GOD gave us both Doctors and Preachers. He can work through both and it may very well take both. It is not a sin to ask either for help. It might even save a life.