Wow I would never be able to stop reseaching until I found all of the answers- and the decendants too!
At any time during any renovations have you ever found old newspapers/letters in the walls or under the floorboards or other paraphernalia like that- especially since it was a hospital. No graveyard for empty medicinal bottles?
And funny I bumped into this story on YT a few weeks ago that might interest you too...
And what about the ghosts????