Margaret Rosannah Davisson was the daughter of Nancy McIlhaney and Nathaniel Davisson. She was the sister of Theodore Nathaniel Davisson and Frederick Augustus Davisson. Frederick married Elizabeth Derrickson Wickes and had 8 children: Sophia Anne, Rosannah, Agnes, Elizabeth, John William, Marietta, Etta and Augustus. Augustus married Rheta Witte and had three children: Robert, Frederick Augustus (born in 1904) and William. Frederick Augustus Davisson married Ruth Tyler and had a daughter named Elizabeth Ruth. She married Byron Burnell Davis and had three children: William Preston, Kathryn Elizabeth and James Frederick. James married me (Jean Marie) and we have a daughter named Jamie Elizabeth.
Since Margarets' brother Frederick is my daughters great great great grandfatherI guess Margaret would be her great great great aunt.