Hi Trudi,
My great grandfather John Holmes is buried in Killea graveyard which is on the border between Derry and Donegal, don't know officially which side. date was 1900. I could not find his tombstone but there is a Holmes family plot in the cemetery.
The photos I have are greater than 500 kb, maybe I will try to zip them.
There is a place, village? called Holmestown near Raphoe, Donegal
Hope this is of interest.
Sam