You will need to trace the family back to the 1870 census before you can start slave research.
This is how I'm reading the 1920 census of Willis DIXON household:
Wife Ester age 51
Daughter, Ressie or Bessie, 20
Daughter,Joshie, 19
Son, J.N.C., 15
Daughter, Jessie, 14
Daughter, Perie or Ponie, 12
Son, J.C., 8
Daughter, Johnny L., 2
Grandson, Leroy, 2 months

Here the family is in 1910
Jackson County, FL, Precinct 12, ED 43, sheet 12B
DICKSON, Willis, B, 45, Married 1, 25 yrs, born FL, parents FL
Easter, wife, B, 40, 15 children, 12 living, born FL, parents FL
Eddie, son, B, 14
Rissie, dau, B, 12
Jossie, dau, B, 10
Willis JR, B, 08
Lassie, dau, B, 07
MCW, son, B, 04
Plassie, dau, B, 03

There is another DICKSON household a few houses down:
DICKSON, Earnest,B, 22, married 2yrs, born FL, parents FL
Mandy, wife, Mulatto, 22, 2 children, 2 living, born FL, parents FL
Alma, dau., Mu, 04
Baby, son, Mu, 4 months

Vera