Question: are antigone and ismene twins?
Answer: Ismene (/ɪsˈmiːniː/; Ancient Greek: Ἰσμήνη, Ismēnē) is the name of the daughter and half-sister of Oedipus, daughter and granddaughter of Jocasta, and sister of Antigone, Eteocles, and Polynices. She appears in several plays of Sophocles: at the end of Oedipus Rex, in Oedipus at Colonus and in Antigone.