Your Gideon Pemberton and his wife Mahala Koger are supposed to be the parents of George Washington (not Gideon W.) Pemberton, and the inlaws of the Elizabeth Ann Porter Pemberton who is probably my ggg aunt Eliza Porter. Gideon and Mahala Pemberton died early, leaving orphaned children. The parents of Gideon Pemberton the husband of Mahala Koger are supposed to be George Pemberton and his wife Mary Lyon. If you search on ancestry for 'Washington Pemberton', you will find a database maintained by a lady who is descended from another child of George Pemberton. He had three? wives and twenty-two? children... I would be happy to correspond, if you wish to email me offlist.