Grace Fenton Mercer was mentioned in the 25[?] April 1800 will of her husband Muscoe Garnett. To beloved wife Grace Fenton all of my house & hold & Kitchen Furniture my Carriage & four horses all the stock of liquor that may be on hand, and that in the year I die that she be supplied with as much Pork & Beef as as may be sufficient for herself & Family. Presented in court on 21 February 1803. [Essex County, Virginia, Will Book 16, pages 201-202.]

On 20 June 1814, James M. Garnett, Paul Micou, Thomas Pitts and Jno. Taylor Lomax were bound in the penalty of $5,000 for James M. Garnett’s administration of the goods, chattels and credits of Grace Fenton Garnett, deceased. [Essex County, Virginia, Will Book 18, page 31.]

On 25 June 1814 and 27 December 1814, an inventory and appraisal of the estate of Mrs. Grace F. Garnett was made by Paul Micou, Thos Pitts and Robt. P. Waring, and was returned to court on 15 July 1822. [Essex County, Virginia, Will Book 19, pages 298–300.]

The estate of Grace F. Garnett in account with James M. Garnett, administrator, from 1814 to 1821 was settled on 29 November 1821 by D. W. Pitts, Robt. P. Waring, and Wm. T. Brooke. [Essex County, Virginia, Will Book 19, pages 307–308.]