Menelaus and his brother Agamemnon were usually said to be the sons of Atreus. Their mother was Aerope, Atreus’ wife. According to an alternative genealogy, however, their father was Pleisthenes, who was himself a son of Atreus (thus making Menelaus and Agamemnon the grandsons, rather than the sons, of Atreus). More @Wikipedia
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