Wide Sargasso Sea
Sandi Cosway is the son of Alexander Cosway, Antoinette's father's son by another woman. Unlike Daniel Cosway/Boyd, Alexander Cosway and his son are members of colored society who are accepted by some sections of white society; they are even informally acknowledged by Mr. Cosway. Sandi appears briefly in the novel: he saves Antoinette from some harassing children, he teaches her to throw a rock…and he's also the love of her life. Antoinette never explains why she never married Sandi, but the novel suggests that the fact that he was colored was an insuperable barrier for her family and perhaps for herself.