I'm in Coleman's Line.Here's some information I have on Richard and Robert.I have not had a chance to research all this, and the info was forwarded from some friendly people here.Hope it helps.
Richard Mitchell of Henry moved to Franklin Co. He was son of Robert & Agnes Mitchell of Henry. Richard's wife was Elizabeth. Here are Robert & Richard's wills: Robert Mitchell, Henry Co 1786/9/28, Mitchell, Robert, will written 1786/4/19, wife Agnes, pers prop for life & negroes. Son John Mitchell, son William Mitchell, son George Mitchell, son, Richard Mitchell. Dt. Juda Collar, dt Agga Boatman, dt Ann Pollard. After death of wife, granddt. Agga Boatman some pers prop. Son William lands & negro then to his son John. Exors: sons John & Richard. Wit: Ignatious Sims, William Brown, John Haley. wb I 135-137 Henry Co VA Will Abstarct, Vol1 & 2, 1777-1820, p 19 1823/3/3, Mitchell, Richard, son James 100A, son Archibald 1/8, son William 100A, wife Elizabeth. 3 dts 100A: Jane, Susannah, Sally Draper. Granddt Elizabeth Mitchell, 2 sons Elisha & Coleman Mitchell. James & William exors Franklin Co VA wb 2, 556