According to Hesiod 's " Theogony " , Iris is the daughter of Thaumas and the Oceanid Electra , and the sister of the Harpies : Aello and Ocypete .
Head entity: ocypete Q3141720 28
Tail entity: electra Q1438693 17
Relation (head \u2192 tail): P25
Inverse relation (tail \u2192 head): P40