I can add a little information about our elusive Berry. There was a second son by Rebecca, John Tillman Mullis born in 1852. He is my ggrandfather. Rebecca may have died in childbirth because Berry did marry again in Laurens County, Georgia, in 1854. He married Martha Weekly. They had a daughter named Mary in 1857. Although Martha and Mary appear in the 1860 Census, Berry is not. I have recently learned that a Berry Mullis appears in the 1870 Census in Union Vounty, NC. I don't know if it is the same Berry or not. It is not confirmed but Berry's sons may have been raised by his brother(??), Joel. Don't know why unless Berry died or just skipped out. Your inquiry stated that Berry was a son of one William Mullis. I believe that to be true but have not been able to confirm it. Do you have some proof of that? Please share whatever may be helpful.