I cannot help you with these much intermarried families, but I feel sure there is help out there. I am a descendant of Sally Tribble, wife of Rev. Andrew Tribble, formerly of Orange Co., VA, Albemarle Co., VA and later of Madison Co., KY. There is a published Tribble genealogy (with documentation), and a published Tandy genealogy. I feel sure both of these genealogies (published in the last 10-15 years) are at the Family History Library (Joseph Smith Building, however) in Salt Lake City. I believe there is also a Quisenberry genealogy.
Perhaps if you ask a specific question about either the Tandys or the Tribbles, I can give you an answer--or attempt to do so. I believe Sally's mother died in Christian Co., KY--testate. E.W.Wallace