Mary Gatewood was mentioned in the 1765 will of her father Isaac Gatewood. At that time she was not yet 18. [Essex County, Virginia, Will Book 12, pages 225-226.]

Mary was mentioned in the 27 June 1798 will of her mother, Mary Gatewood, proved 21 January 1799. “…one fourth part to my daughter Mary Kay…my will and desire is that all the rest of my estate shall be sold and equally divided amongst my Children to wit Andrew, Gatewood, Augustin, Richard, William, Sarah, Tabatha, Mary and Jane…” [Essex County, Virginia, Will Book 15, page 436.]