This is Dr. David
I am sorry about your father's condition.
what medications is he taking?
he might benefit from medications which can help decrease perioral dystonia or myoclonus
things like levodopa and carbidopa (Parcopa, Sinemet) could help.
or a medication like Tetrabenazine (Xenazine), a drug to block dopamine, also may help some people with dystonia around the mouth and nose area.
has he tried these medications?