His profile states he is the husband of Mary Sarah Wall. That name links to his mother. I believe his mother is unknown. I believe Sarah Wall is the wife of the man of this profile.
Prince George's County, Maryland Land Records 1772-1774; Liber BB 3 {Abstract by Mike Marshall}; Page 198. At the request of Thomas Gibbons & Sarah Gibbons the following Deed was recorded March 24, 1773
indenture made 1773; Robert Wall, planter in consideration of the natural love and affection which he hath and beareth to his son-in-law Thomas Gibbons s/o Turner and likewise to his beloved daughter Sarah Gibbons his wife as also for good causes and considerations him thereunto moving and the sum of 5 shillings sterling has given by these presents a tract called "Wheats Pasture"containing 85 acres. Signed Robert Wall in the presence of and acknowledged before John Cooke, John Harrison and at the same time Rebecca Wall wife of Robert Wall relinquished her right of dower
