Wilbur was a witch, just like his mother. He helped his father and brother defend humanity against the threat of the two fae courts - the Seelie and Unseelie courts. Being a witch meant he was vulnerable, that the fae would try to steal him, so he understood the restrictions he was under. It was fine. That was, until his father and brother brought the King of the Unseelie Court to the Fae Hunters Village.