There are some blog posts from a few years ago, about the history of the Bush Hotel on here:
http://bushhotelartist.blogspot.co.u...-research.html
This one has a comment from a descendant of the hotel McDermotts though it doesn't have his contact details:
http://bushhotelartist.blogspot.co.u...n-shannon.html
I wonder whether he has an online tree somewhere that does have a way to contact him.