My g-g-g-grandfather, William Davis, Jr. of Marion District SC married his first cousin, Mary Davis. Their fathers were brothers, William and Benjamin Davis. My g-grandfather, William Hight Davis of Clarke Co. AL married Sarah A. (Sallie) Grayson; when she died, he married her sister, Harriet Elizabeth (Lizzie). His sister, Caroline Emily Deborah Davis, married Sallie and Lizzie's brother, Alexander Harvey Grayson. In Hardeman Co. TN I have three McGlothlin siblings marrying three Crain siblings: Ephraim McGlothlin to Margaret Jane Crain, Samuel Parmlee McGlothlin to Louisa Lemore Crain, and Marah Ann McGlothlin to James Martin Crain. To my knowledge none of the children of these marriages married each other. Nancy Davis Harwood Houston, TX