Thanks Hugh, I will not give up, but no new info has appeared for quite a while. I seem to be the only one with a clue to John's middle initial. It appears in 2 places in my great aunt's notes that she got while researching in the 1940's. I have never seem it anywhere else. It could be wrong. I have seen hundreds of documents for John Cunningham and not one has a middle initial. All the family had middle names, except John's seems to be lost or dropped.
It would be a great help if I could just find the full name of JS Cunningham. I am sure Marcus Cook is my great great uncle.
Thanks for all the help,