Oh, Odrade, if I can stop shaking with laughter, I will try and provide some comfort. My family is full of nutbars, too.
He shot himself through the mouth. I'm not sure what he was aiming at, but he shot a hole in his tongue, blew his lips off, and messed up his teeth that he just paid $2500 in dental work last month. Other than that, he'll be "fine." Whatever they think that means. Personally, I don't know what to think of all of this. I'm not particularly close to my Grandfather, and don't like to see him suffer, but really, he's NUTS
At least, that is the excuse I am using for my gallows humor. You know what would be worse than dying quickly? He is so inept, he may be condemned to die slowly! He has no idea how to do it right.
I think you need two things:
(1) Personal sanity
(2) Know he's safe.
For (2), you have plenty of information here to have gramps declared "a danger to himself or others". Get him committed and in a long-term facility for his own safety. Find out how, and do it. After that, take care of (1). Stop taking the calls, refuse to take updates, distance yourself. For your sake.
Poor gramps. He needs to be protected from himself. What next? An ear, a toe? It would be awful seeing him slowly blown away in bits like that.