
Fanny Belle Johnson(1869-1950) began working with her pianist-husband as a comic reciter, usually in dialect, from the 1890s.
DeKnight did some legitimate theatre work, usually cast in ‘Mammy’ roles, and it was this that led King Vidor to choose her to play the mother in Hallelujah.
She made one further, uncredited, film appearance, then returned with her husband to their previous touring act.