Rich, I'm sorry I missed this the first time round.
Just want to send you my condolences.
Be kind to yourself. If you can't suffer fools gladly when your family visits, then don't. Let them know your actual thoughts witnout the, "but I might piss off the JWs" filter.
Be polite and kind as you would with anyone else in the world, but you don't have to tiptoe through the tulips so as not to upset them. You don't have to pretend that he's sleeping and will be resurrected shortly. You don't have to shy away from saying that you're devastated that he's gone and none of the family will ever see him again.
They are adults and should be in control of their emotions. Don't let them emotionally blackmail you. Everybody has the right to express their own grief as they feel it.
So sorry you're going through this. Wishing you strength...strength and peace.
GT