Humans are not allowed in the fairy realm. Period. That includes half-fairy/half-human babies. The only solution is to give the baby to its father before the Fairy Council finds out her secret.
Misfortune of Vision
In 12th century Ireland, Orlagh has been Seer to her king for forty years. He doesn’t want to hear her prophecies of war and destruction, and dismisses her efforts to warn him. Therefore, she is determined to fulfill her own quest: to find a worthy heir for her magical brooch.