It looks like Robert and his family have been combined with the family of a different man named John Patterson, husband of Margaret Baskin. Per Ancestry they were married in Ninety-Six, South Carolina (date uncertain but son William was born in 1777). John died in Elbert, Georgia in 1808 leaving a will which named wife Margaret, children William, Frances, James, Robert, Samuel, John, Elizabeth, Thomas, George, and Alexander.
Image of the will is on Ancestry:
Author: Georgia. Probate Court (Elbert County); Probate Place: Elbert, Georgia
Ancestry.com. Georgia, Wills and Probate Records, 1742-1992 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Original data: Georgia County, District and Probate Courts.
I found a DAR record for one of the sons (Robert Patterson born 1763). That profile had a source to a FamilySearch pedigree file that seems to be the source of 15 kids of this Robert (born 1727).
See https://www.wikitree.com/wiki/Patterson-11337 for links.
Kids listed in the unsourced FS pedigree file for Robert (born 1727):
Login to FamilySearch required to see more.
it gets better (not)...
I've been working off DAR records trying to source existing Patterson profiles (making some progress).
I encountered a family... Robert b 1720 Scotland (DAR/bible) son of John & Jean Patterson (same page as bible transcription but...)
Will of John Patterson, dated Nov. 1755, names wife Jean & several sons, including one named Robert, and ONE grandson - John, son of Robert. Yet transcription of Robert's bible shows he had 4 living children as of Nov. 1755, so why name just John and not also grandsons Solomon and Josiah or granddaughter Lidea?