WLCOME TO NT
So sorry your father has MG. Here is the link for that forum:
http://neurotalk.psychcentral.com/forum77.html
They can do special x-rays while swallowing, to diagnose the inability to swallow.
He can also have a feeding tube placed, so you can crush and run through the tube. Works out great if needed. You can keep the patient hydrated, give them prune juice and things they normally wouldn't want to swallow.
Just a thought or two.
Oh. You're good. you found the MG forum. I posted this in the "New" section.
Lots of info here.