Sorcerer's Son (Del Rey Book)

Sorcerer's Son (Del Rey Book) by Phyllis Eisenstein. mass_market edition. ISBN: 9780345276421.

"This is the story about a boy whose mother is a sorceress who uses spiders to make magic. The boy does not know his father and was told he died. He goes in search for him and to learn about himself. He does not want to be a sorcerer, but a knight like his father. He does not know that his father was really a sorcerer. His father is a sorcerer who uses demons and tries to kill him and his mother because his mother wont marry him. He learns how to be a sorcerer and use both spiders and demons."