I'm sad to read that you've had to watch and suffer along with your father with that dreaded disease.
I was fortunate in that my father had a mild stroke, then a pretty good year, followed by a steady decline for another year and then passed quickly. The last months, while still sharply aware of his surroundings, he couldn't carry a thought thru to conclusion, forgetting what he wanted to say or couldn't find the words, so he just shut down.
Helping our parent generation pass on to their Reward is not an easy task.
Prayers for an easy transition for him and for your family to find peace that passes all understanding.
Prayers too for your church's endeavor!
Keep the Son in your eyes!