A follow-up on Denise's work:

1870 Census St Paul, Clarendon Co., SC
Moses Oliver 53 M B Farmer $0 $350 b. SC
Rachel Olver 48 F B Keeping House b. SC
Dollie Oliver 22 F B Farm Laborer b. SC
Moses Oliver 19 M B Farm Laborer b. SC
Negle Oliver 16 M B Farm Laborer b.SC
Bacchus Oliver 14 M B Farm Laborer b. SC
Fredrick Oliver 12 M B Farm Laborer b. SC
Sarah Oliver 10 F B At Home b. SC
Mary Oliver 3 F B At Home b. SC
Margaret Oliver 7mon F B At Home b. SC born in Nov.
Rina? Oliver 18 F B Farm Laborer b. SC
Gabriel Oliver 5mon M B At Home b. SC born in Jan.

1880 Census St Pauls, Clarendon Co., SC
Nigle Oliver Head M B 25 married Farmer b. SC Father SC Mother SC
Charlotte Oliver Wife F B 21? married Works on Farm b. SC Father SC
Mother SC
Mary L Oliver Daughter F B 2 single b. SC Father SC Mother SC
Largess? Oliver Son M B 1 single b. SC Father SC Mother SC

a few doors away:

Moses Oliver Head B M 65 married Farmer b. SC Father SC Mother SC
Rachel Oliver Wife B F 62? married Works on Farm b. SC Father (left
blank) Mother (left blank)
Maria Brailsford (no relationship listed) Mul F 10 single b. SC
Father SC Mother SC

I couldn't find Rachel or Moses in 1900. I did find Nigle. He was
the father of your great-grandfather Thomas Oliver.

1900 Census St Paul, Clarendon Co., SC
Nigal Oliver Head B M b. Sept 1850 age 49 married 22 yrs b. SC
Father SC Mother SC Occu: Farmer
Charlotte Oliver Wife B F b. May 1860 age 40 married 22 yrs 10
children born 10 living b. SC Father SC Mother SC
Elijah Oliver Son B M b. Jan 1879 age 21 single b. SC Father SC
Mother SC
Edmund Oliver Son B M b. Nov 1881 age 18 single b. SC Father SC
Mother SC
Nancy Oliver Daughter B F b. Oct 1882 age 17 single b. SC Father SC
Mother SC
Richard Oliver Son B M b. Oct 1885 age 14 single b. SC Father SC
Mother SC
David Oliver Son B M b. Nov 1886 age 13 single b. SC Father SC
Mother SC
Annie Oliver Daughter B F b. Oct 1887 age 12 single b. SC Father SC
Mother SC
Thomas Oliver Son B M b. Nov 1892 age 7 single b. SC Father SC
Mother SC
Lizzie Oliver Daughter B F b. Apr 1894 age 6 single b. SC Father SC
Mother SC
Rachal Oliver Daughter B F b. May 1895 age 5 single b. SC Father SC
Mother SC

1920 Census St Paul, Clarendon Co., SC
Thomas Oliver Head M B 28 married b. SC Father SC Mother SC Occu:
Farmer
Emma Oliver Wife F B 24 married b. SC Father SC Mother SC
James Oliver Son M B 4yr 4mon single b. SC Father SC Mother SC
Jerry Oliver Son M B 2yr 1mon single b. SC Father SC Mother SC
Annie Oliver Daughter F B 4?mon single b. SC Father SC Mother SC
Jamy** Oliver A. W.? M B 16 single b. SC Father SC Mother SC

** The index says James, but to me, it looks like Jamy.

South Carolina Death Index, 1915-1949 Record
about Charlott Oliver
Name: Charlott Oliver
Death date: 25 Apr 1915
Age (years): 57
Estimated birth year: 1858
Gender: Female
Color: Non-White
County of death: Clarendon
Volume number: 13
Certificate number: 6435

South Carolina Death Index, 1915-1949 Record
about Emma Oliver
Name: Emma Oliver
Death date: 16 Mar 1922
Age (years): 24
Estimated birth year: 1898
Gender: Female
Color: Non-White
County of death: Clarendon
Volume number: 7
Certificate number: 5192

South Carolina Death Index, 1915-1949 Record
about Nigle Oliver
Name: Nigle Oliver
Death date: 26 Jan 1918
Age (years): 66
Estimated birth year: 1852
Gender: Male
Color: Non-White
County of death: Clarendon
Volume number: 2
Certificate number: 545

South Carolina Death Index, 1915-1949 Record
about Thomas Oliver
Name: Thomas Oliver
Death date: 17 Aug 1929
Age (years): 36
Estimated birth year: 1893
Gender: Male
Color: Non-White
County of death: Clarendon
Volume number: 22
Certificate number: 13800

Social Security Death Index Record
about James Oliver
Name: James Oliver
SSN: 256-54-7422
Last Residence: 29148 Summerton, Clarendon, South Carolina, United States of America
Born: 15 Aug 1915
Died: 24 Jun 2001
State (Year) SSN issued: Georgia (1953 )