Who is Beth, Casey, Lil, Aunt Granny Lith from The Vintage Book of Contemporary American Short Stories and what is their importance?

Beth is Casey's third wife. She is proud and stubborn, and when Aunt Granny Lith give her and her husband trouble, she decides that she is going to fix the matter once and for all. She is in the more typically masculine role in the relationship with Casey, making the decisions and telling him what to do.