One of the major conflicts of the novel is between Tristram and his brother, Derek. Very much alike at first, Derek chose a different path from Tristram and pretends to be homosexual while in public, to help his career as a government official. Derek has an affair with Beatrice-Joanna, and when she forgets to take her State-provided contraceptives she becomes illegally pregnant. She has sex with her husband, Tristram, and his brother, Derek, within a 24-hour time span, thus the paternity of her twin boys is uncertain.