from a lookup in Concord MM marriage certificates 1679-1808; There is no Tibbet in the index, and the only possible I find is ; Rose Tebbets, who attended the marriage of Nathaniel Newlin and Mary Fincher, 1729. As there are no marriages for this name,either spelling, I'd be inclined to think this was a non-Quaker neighbor or friend, who attended as that, not as a meeting member. S.