Kildare's cousin Gwyinnion, often referred to as "Mad Ginny" was driven to insanity some 70-odd years ago (1930s) after surviving a brutal Faerie massacre in the English town of Cottingley, during the famous outbreak of "Faerie Mania" that gripped that area early in the twentieth centuty. She is a sad, delicate and profoundly damaged soul, and Kildar makes it a point to look after her.
The attack in Cottingley left her pregnant, and she gave birth to a son who was used as a vessel for an ancient evil known as the Dark One. Along with her cousin Kildare , Gwynnion stopped the Dark One (see volume 1, The Magic of Aria). Stopping the Dark One did not heal Mad Ginny's broken spirit, but it did give her some peace of mind.