Question: Who is the son of Hydra?
Paraphrase: Who is Hydra's son?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q170379 wdt:P22 ?X . ?X wdt:P40 ?answer}
Answer: Cerberus, sphinx, Hydra, Chimera, Scylla, Nemean lion, Ladon, Orthrus, Aethon, Crommyonian Sow, Colchian Dragon, Anemoi Thuellai, Gorgon