Edna CLYCE half-sister, Wm R ANDERSON

Edna CLYCE, m to Frank CLYCE, was supposedly a half-sister to Wm Riley ANDERSON.I am seeking any information on the ANDERSON family.

They lived in Madison Co TN.Parents of Wm Riley were William R. and Ellen (CURRY) ANDERSON.Wm Riley was married three times that I know of:

Nancy Elizabeth "Betty" HART
Lovie DORRIS
Zora WHITTEN/WHITTER?

Evidently either Wm or Ellen had to be married before for Edna to be a half-sister.I would love to find someone researching these ANDERSONS.

Thanks