Their Father was ? Martin Black, Benjamin Black or James Black. I do know that their father was kill in the early days of Colo. Believe he also is from ILL., there is quite a twilght zone in this history.Margaret R. Black. Married Sgt. Charles Mahr, 1877, Wyoming Terr. at Red Canyon. Grampa Mahr was with the 2nd, U.S. Calvary, serving with Co. M. Believed under Capt. Mix.