Abner Greenleaf could have been a relative to Betsy Brown Marden (b. Dec. 2, 1834). She had a son with John Pickering Batchelder (b.Jan 18, 1835; m. Mar. 24, 1858) named Walter Greenleaf Batchelder who was born Sept. 25, 1867. So far this is the only person with Greenleaf I've found.