Rather, Davis Sisters.

On the first one by Blind Willie Davis, Paul Oliver says: it "was a sung monologue apparently based on the white song, Where Is my Wandering Boy Tonight?", quoting from the Davis version (Songsters and Saints, p. 212):

I saw my old mother,
An' I was sittin' at the winder,
And a house full of sobbin'
And a house full of moanin' too.
Goin' down the street,
She wonderin' "Where is my boy tonight?"
And I wonder where he's gone--
Go and see if you can find him.

~Masato