It's been a while since we have been in touch. I may have found a few things for you to ponder. First of all, the George who was married to Isabella was likely the uncle of Charles, Jr. rather than his brother. I think that the brother, George, was married to an Emma [per 1920 census]. George [bn ca 1855/1856] and Isabella were on the 1880 and 1900 census with their family.
In 1880, I think that the George, Charles and Hampleton Morgan may have been brothers. Perhaps their mother was Harriet who was also in Lafourche Parish. George and Hampleton both had daughters named Harriet. Also, in 1880, Elis Morgan, age 9, is listed with Harriet and also with Hampleton. I figure he was staying with his grandma when the census was taken.
I found the death record for Bella/Belle Morgan. She died 1/30/1930. Her parents are listed as Henry Watkins & Susana Johnson. This sound familiar...did we find this already? Charley Morgan is the husband. In 1930 Charles is living alone and is a widower.
I found info on two of their girls. Bertha Morgan McGlover died on 8/10/1916 in Beaumont, Jefferson Co., Texas. Her birth date is given as 3/4/1894. Her parents are listed, but though she is listed as married, no husband's name is given. She was buried in Thibodaux on 8/10/1916.
The youngest child, Elizabeth, died in Thibodaux on 1/22/1927 at age 31. Again, the parents are given, but though she is married [Smith], no husband's name is given. The certificate number is 634.
In 1920, I found Charles  and Bella  with four kids: Aurelia , Adelle , Rebecca  and Mabel .
I am not finding the Morgans on the 1870 census. I did find a Manuel Morgan [59 NC], but he was married to a Lucy. Of course, this could be another wife. All three Morgans on the 1880 census show that their father was born in NC.
I hope this info advances your research a bit.
We are having lots of rain in Louisiana. It is hot, but not as hot as usual. The rain keeps the temperatures down.