Hello, I think this might be your Willis & Sarah FELPS in the 1870 Census for SC. Notice the spelling of PHELPS rather than FELPS.

1870 United States Federal Census
about Willis Phelps
Name: Willis Phelps
Estimated Birth Year: abt 1835
Age in 1870: 35
Birthplace: South Carolina
Home in 1870: Hunter, Laurens, South Carolina
Race: Black
Gender: Male
Value of real estate: View Image
Post Office: Clinton
Household Members: Name Age
Willis Phelps 35
Sarah Phelps 30
Elin Phelps 15
Alen Phelps 15
Andy Phelps 11
Gains Phelps 9