I have read this and actually downloaded it to my site, however if one tries to look up Joseph Lilly, there is no records of those facts that I can find. He was definitely the owner of the Lilly Inn where Lincoln used to stay in his rounds of the countryside. But can't find a record of his birth in Maryland.
As for Adam Fisher, father of Mary Lilly who supposedly was in the revolutionary war...has to be mixed up with the Adam Fisher who actually was in that war and never had a daughter named Mary.
Frustrating to say the least.