WOW! I found online a city directory, known as "Polk's Directory," for the year 1913. It lists my Mother's Great-Grandfather: John Hanna Coffee. See the right-hand column for "J H COFFEE." Evidently he had a grocery store with a combined restaurant in the town of Kingston, Marshall County, Oklahoma. I knew from his obit (that appeared in the Kingston newspaper) that he had a local business. But other than the "confectionery" store listed as his "Occupation" in the 1910 Federal Census, I had not found any mention of how he made a living. Until now. See for yourself:
He died in 1913, and his will was hotly contested by his two heirs. But that's another story, folks