The Petty documentation of a will in Union, South Carolina has much more weight as evidence than a database which may consist of family group sheets, ancestral charts and family stories. www.pettygenealogy.com is more reliable since they do have some sources referred to. These are things that can be checked for accuracy.
I do believe that someone along the way might have Sarah Clanton confused with the Sarah who married James Patty. It has been an ongoing problem when folks copy others' family trees without questioning the validity of these. Sylvia