I am sure there are books written about him but not sure if would include his family. Try Four Courts Press.
There is now a Center for the 1798 Rebellion, I'm not sure if they have materials on individuals or not. Might be
worth a try.
There have been others asking the same question while I've been on rootsweb if you go back through requests for info you might find someone who found information.
ps there are 117 John Murphy's buried in Wexford in the Cantwell Memorials and I know I have read about the Rev.
in CD. Also there are 65 Thomas Murphy inscriptions.