Reuben Munday was mentioned in the 5 September 1835 will of his father, Francis Munday, proved on 19 October 1835. [Essex County, Virginia, Will Book 23, page 415–417.]

In 1836, a suit was filed in chancery court. Orators and oratrices Henry Munday, Reuben Munday, Francis Munday, John Munday, Alexr Baker and Catharine his wife, Lucy Munday, and Mary and Sarah Munday infants under the age of 21 by Henry Munday their guardian and next friend. That their father Francis Munday departed this life in the month of September last seized of land and negroes, testate, leaving a widow Elizabeth. He also left a daughter Elizabeth Brown wife of Joseph B. Brown. Son James Munday was named his executor. [Essex County, Virginia, Box Chancery 39-D-7.]

On 1 May 1837, Reuben Munday witnessed the will of William Younger. [Essex County, Virginia, Will Book 24, pages 380–381.]

On 9 January 1838, an inquisition was held at the dwelling house of Elizabeth Tune in the Town of Tappahannock on the death of Jesse Tune, made by James Roy Micou Jr, Reuben Munday, Vincent Dyke, Jackson Dyke, Jonathan Dunn, James Durham, James Phillips, Green Coleman, Philip Gatewood, Mourning Johnston, Reuben L Pitts, and Robert M Pilcher. [Essex County, Virginia, Will Book 24, pages 243–244.]