Question: are helen and clytemnestra sisters?
Answer: Helen of Troy She was daughter of Zeus, either by Leda or by Nemesis, and sister of the Dioscuri. ... She was also the sister of Clytemnestra, who married Agamemnon. Helen's suitors—including Odysseus—came from all parts of Greece, and from among them she chose Menelaus, Agamemnon's younger brother.