It's very difficult to find anyone's parents who was born prior to 1840.
South Carolina wasn't recording births until 1913; unbelievable as that is.
Marriages weren't recorded until 1911.
They did start recording probates in 1671. The SC Dept Archives & History, www.archives.sc.gov
has wills 1782-1855, plats state land grants 1784-1868, legislative papers 1782-1866, criminal court records 1769-1891 & grand jury presentments to General Assembly 1783-1877. Successful Searching!