Thanks for the posting, Jo Ann. (This is just the sort of thing I see before going away for two weeks!) I'm not clear as to your interests and the extent to which you're "in" to this Gadd(e)y family. I have a few quick comments and suggestions I'd like to offer in response.
The 1999 book, "That Our Names May Be Written," by the late William C. Gaddy and his wife, Corinne (now out of print) is an essential starting and reference work for the Gaddy descendants of William (d. 1751) and Mary Gadd(e)y of Virginia; their son, Thomas ("T1" c1720-26 VA-c1787/88 NC)and his wife, Lucy, who took their son, Thomas ("T2"--c1753 VA-c1814 NC) and siblings to NC in 1760. This Thomas (T2) had a younger brother, Ithamar (5 Jan 1766-6 Jan 1851--his name being Biblical--one of the three sons of Aaron, brother of Moses in Exodus)--the "Ithamur" of your posting.
Acquisition of land in Martin County, NC by Thomas (T1 or T2?) has been a puzzle for me--whether he actually moved or the name of the county in which he was located overtook him.
Having participated in the Rev War for eight years, older brother T2 settled in Anson county, NC. After their father's death, Ithamar looked after their mother and sisters, making their home in Robeson Cty and eventually (c1804) moving just across the line into Marion District of SC (since 1910, Dillon County).
Ithamar's son, Silas (sixth child of eight) acquired "Gaddy's Mill" from Nelson Ford, gs of Preserved Ford, 3 Nov 1843.
I was especially interested to note that you have Preserved Ford's wife a Miriam (no dates; one of three wives), for one of the daughters of "T1" was "Merrium," [sic] who married a Thompson "before 21 December 1818" (Gaddy and Gaddy, p. 350). (No indication whether this was a first or later marriage for her.) Drusilla ("Drewsiller") Cooper was her sister, "married before 1787."
"Gaddy & Gaddy" cite a 1974 Shooter Family history ("The Shooter Family..." by C. S Kyles) that seems to bear on the Coopers and may be of interest if you have not seen it. They also cite (p. 97) a 23 Dec 1786 sale of land in Edgecome cty, NC, by a James and Elizabeth Brogdon to Thomas Gaddy, witnessed by Joseph Cooper and Thomas (T2?) Gaddy.