who had a Sunday visitor that left the screen door open and cast a shadow on the corner of the house?

In the short story "A Good Man is Hard to Find" by Flannery O'Connor, the character who had a Sunday visitor that left the screen door open and cast a shadow on the corner of the house is the grandmother. This detail sets the stage for the story's unfolding events, highlighting the themes of family dynamics and the unexpected nature of encounters. The open door symbolizes an invitation to chaos and change in her seemingly mundane life.