I believe that the Betsy with Tom and Alice in 1880 are the right ones. I found them in 1870 in Claiborne County. Claiborne and Webster counties lie next to each other. In 1870, it states that a Elizabeth Berry age 28, born in Virginia with children, Alice age 12 and Thomas age 8. The ages are off some but there are many similarties. 1. The 1880 Thomas and the 1870 Thomas are both called Mullatos. 2. In the 1880, Betsy is called Elizabeth, which is common.
3. Both censuses state that Betsy is born Virginia. 4. In 1870 Elizabeth/Betsy is living with a white family named J. G. Lewis and his wife, M. E. Lewis with two sons named Americus and Nolen. Now in 1880 we know that Betsy is living Chary Mack but guess what? In 1880, living near Besty is the same white family that she is living with in 1870. In the 1880, the white family is listed as Jacob G. Lewis and wife Mary E. Lewis with sons A. L. Lewis and Noland Lewis.

Note that Jacob G. Lewis was born in Georgia on both census. Now in 1900, Tom Berry with wife Millie states that his father was born in Georgia. Also, remember that Tom was listed a mullato on both the 1870 census and the 1880 census. So, the white Jacob Lewis could have been his father. No husband is listed with Betsy on either Census.

I hope this helps,

Tony