I can't find anything in his notes indicating the name of his 2nd wife and no mention at all of three marraiges:
"Long was married twice. His first wife was Mary Reynolds (1736–58), of Virginia, whom he wed in 1752; they had two children: Gabriel (b. 1754), who married Sarah Ann Richmond, daughter of William Richmond, who was the brother-in-law of Sir Peyton Skipwith; and Anne, who married William Martin of Halifax. On 24 Aug. 1761 Long married Mary McKinne. They had eight children: Nicholas, Jr. (m. Rebecca Hill; d. 22 Aug. 1819), Mary (m. Bassett Stith of Virginia), Richard H. (m. Betsy Pasture), Lunsford (m. first Rebecca Edwards and second Mary Copeland), Martha (m. General William Gregory), George Washington (m. Sarah C. Jones), John Joseph (m. Frances Quintard), and Lemuel McKinne (m. Mary Amis). The second Mrs. Long was active in supporting the work of her husband. When the army of British commander Lord Cornwallis quartered in Halifax on its way to Yorktown, Va., an officer of the staff of Colonel Banastre Tarlton appropriated her riding horse. The lady, according to a family story, approached Tarlton and demanded, in no uncertain terms, the return of her mount. Apparently, she impressed the old soldier, who granted her request. Surviving for many years after her husband's death, she died at home on 21 Nov. 1821. Long and both his wives were buried at their plantation, Quanky, in Halifax County."
I'm tring to determine whether he was actually married to a Gibson, making me related to their descendants. If he didn't have a Gibson wife, I'm not related to any of his children via Gibson lines.
Thanks in advance for any additional info.