Sadness of a thin letter

I have been trying to find additional information on Edward McFadden (abt 1804-abt 1887) and Alice Collum (abt 1804-1886) my maternal great great grandparents. In the 1860 and 1870 census they are living in Vinton County, Ohio. Both were born in Ireland and according to their son John’s Civil War pension application they were married there before immigrating.

My great grandfather Dennis McFadden (abt. 1874-1924) and my grandmother Ruth McFadden Webb (1905-1984) were practicing Catholics, so I believe that Edward and Alice were as well. I wrote to the Diocese of Columbus Catholic Record Society so that they could search their records for the McFaddens.

I was hoping for at least a death or burial record but unfortunately they were not able to find anything on this McFadden family. When I went to the mailbox and saw the very thin envelope, I knew that they hadn't found anything.

Not sure what my next step will be, but I am finding it difficult to get any of my ancestors back to Europe.