I had my daughter go to the gravesite of Bertha & Clem; it is located in New Bedford, MA
The names on the stone were: Clement A 1901-1980
Frank Jackson 1867-1923
Sarah J Jackson 1869-1947
James Cocker 1920-1945
Harry C. Jarvis 1890-1957
Amelia Jarvis 1888-1970
Clem also has a small stone in front that reads "Private US Army WWII"
I did some digging and Bertha was married before Clem to a James Cocker, and had a son named James Cocker.
This is all I have right now; keep in touch! This is great!!