In the novel "Demon Copperhead" by Barbara Kingsolver, Demon is reflecting on his own upbringing and the circumstances that shaped him. When he says "Four demons spawned by four different starving hearts," he is referring to himself and his three siblings. By "starving hearts," he means that their mothers, who may have struggled with their own challenges and hardships, were unable to provide them with the nourishment and care they needed. This metaphorical language suggests that their upbringing was difficult and lacking in emotional support.