Hi,
Yes, Fred was my Great grandfather.
Your father was Robert M. Coy, born 1903? So he was 6 when Bertha died?
Do you have any information about Elizabeth's death? I can find no record or grave. I have put up a photo of Rodney and Hattie's stone from Landgrove on the findagrave.com site.
After more research it turns out Fred and John's sister Hattie was an older sister. I couldn't figure out why she wasn't in the 1880 census but she was already out of the house.
I have John's death date as 7/26/1887 cause of death - curvature of the spine. He was listed as a farmer in Burlington.
This line of Roby's is listed all the way back to the 1490s in Castle Donegal on FamilySearch.org
I have some info on the daughter Pearle if you need that, as well.
Thank you for responding!
Beth