Carol Mayo Nickerson, b 17 June 1894 in Marblehead, MA, daughter of Henry Crosby Nickerson and Dora Milne Mayo, married 17 June 1918, her 2nd cousin, once removed, Hollis Winsor Nickerson, b. 11 August, 1893 in Danvers, MA, son of Winsor Cecil Nickerson and Abigail Baker Crosby.
Their common Nickerson ancestor is Dean Nickerson. Carol's line of descent: Dean, Henry Blide, Henry Crosby, Carol Mayo Hollis Winsor's line of descent: Dean, Winsor, Winsor Cecil, Hollis Winsor
Dean's Nickerson line of descent: William, William, William, Nathaniel, Nathaniel, Nathaniel and then making Dean Generation 7.
My guess is that they are also somehow related through the Crosby family since Henry Crosby Nickerson's mother was Thankful Emily Crosby.Carol Mayo Nickerson's mother was Abigail Baker Crosby.