The 1790 census enumeration for Benjamin Greentree included himself as head, James C., and the following females: his wife, Mary Cash Greentree; and daughters Mary, Eleanor and Margaret.This is the only record I have linking her to Benjamin; unfortunately, the census in 1790 did not list names.The other Greentrees contemporary with Benjamin were his cousins, Alexander, Matthew and Robert.Alexander had a daughter, Mary, who is accounted in census records in 1800, 1840, 1850, and 1851, and a marriage record in 1804. Matthew had a daughter born about 1775, and i would venture that her name was Mary.The younger 2 children enumerated with him in the 1790 census were the children by his second wife's first marriage (Susannah Kinnemont Hartley). His daughter was enumerated with him and Sussannah in the 1800 Delaware Census.Robert was in Tennessee, probably before 1787; Georgia Vallejos presented some records for Robert in her posting in these message boards, but the records I have for him place him in Md during the 1770's and Tn during the early 1790's.I could not locate his land grant, and records began in 1787, so he was probably in Tn earlier than 1787; therfore, I would rule him out as the father of Mary. The other brother, Isaac, was an express courier from eastern shore counties to the Philadelphia convention in 1776, and the last record of him was in 1777 where he was paid money owed by an estate.He apparently died during the war; so that rules him out as Mary's father. The most convincing evidence that Benjamin was her father comes from the names of her middle children: Mary, Elizabeth, Margaret and Benjamin.I hope this information is useful.