Thank you to all the helpers!
The Ancestry tree is mine, and the 19th century Parkin material was given to me by my uncle, who got the Edmund George Parkin and George Parkin details directly from his grandfather Edmund George. That uncle, a WWI veteran, was my first genealogy mentor.
George Parkin (with a wife named Mary Ann and a son named Edmund George) appears in no census that I can find. The Rockingham Street George is just a possibility, nothing more. My uncle reported George was born in Heeley, but the CoE church there tell me their records burned in the early 20th century. Are there Bishops' Transcripts somewhere?
I had thought that the census might show who lived at the Rockingham St address. Does anyone have access to images?
Edmund George went to America as a young single man. My best guess is 1850-1860. He apprentices as a silversmith before leaving, so he would have been 18 or so. He married in 1860, so he must have taken at least a few months to court the girl. Can anyone tell me which port a Sheffield emigrant would have used? He is likely to have gone to Boston, because he settled nearby in Massachusets.
Thanks once again. Ernest Parkin