Thanks for the quick and generous response on this query.
From records I have gleaned, I know that William Granville Dennis was one of the first born of Granville Henderson Dennis and his wife, Mildreth "Millie Ann" Lewis. I know for certain, based on family history that at the time of his birth, his grandfather, William Dennis, resided in their household in Alabama. There he probably grew up to know his grandfather in her formative years.
However, the time-frame, of his exit from the family is blurred. At the beginning of the War of the Rebellion, Union soldiers flooded into Alabama and Mississippi and began a wholesale destruction of property. My paternal grandfather, Walter Edward Dennis Sr, explained to me the Yankees came and burned down plantations, homes, houses, property, and everything that could be destroyed. The story goes that they put everything a covered wagon and fled to Louisiana. In 1860-61, they resided in Junction City, Louisiana, for a spell, and then moved around Arkansas, following Millie Ann's family, until they stopped in Union County, where they settled in Tubal. By that time, there were many other children born until the death of Granville Henderson Dennis died ca 1877. From there it becomes blurred again. The next thing I know Millie Ann went to stay with her son Joseph Chesley Dennis and his young wife, Sarah Elizabeth White. She was there at the time of the birth of her first three children. Two female children died in infancy due to a measles epidemic, whereas the third female child died at the age of three years of measles as well. The result was the 70+year old Millie Ann succumbed to the measles also. Oddly enough, as many years as I've studied, I've never found the cemetery the Dennis Family buried their own. It has to be in Union County, Arkansas, but no leads of of yet.
As for William Granville Dennis, named after his father and his grandfather, at one point, relocated to Texas. You find me at a disadvantage. I do not know when he left the large family. All that I know is he went to Texas and never returned. Even the reason is unclear to me, but that's the way families are...surrendering one child at a time one way or another.
I had Ancestry.com at one time, and this is the way, I found out about W.G. Dennis. What you have supplied sounds like the family, but I cannot remember the name of his wife, or do I know about where the couple married, or where his family generated out to. Ironically, the ones who went to Amarillo,TX, I never knew about when I lived and worked in Amarillo from 1997-2000.
My search continues. Again, I am at a disadvantage, but am considering a return to Ancestry.com to build my case.