The novel ends with an epic flood, almost Biblical in proportion, that forces Ma and Pa -- with Rose of Sharon, Ruthie and Winfield in tow -- to find higher ground. In part they are spurred on to aid Rose of Sharon's health as she has just lost her baby and is still feeling unwell, both physically and emotionally. They seek shelter in a barn, only to encounter a boy and his father, who is dying of hunger and can no longer digest solid food. The novel ends when Rose of Sharon
loosened one side of the blanket and bared her breast. "You got to," she said. "there." Her hand moved behind his head and supported it. Her fingers moved gently in his hair. She looked up and across hte barn, and her lips came together and smiled mysteriously (455).
What is the significance of this gesture and the image this scene is describing?