Diana Wynne Jones
Chronicles of Chrestomanci 1
THE CHANTS are a family strong in magic, but neither Christopher Chant nor Cat Chant can work even the simplest of spells. Who could have dreamed that both Christopher and Cat were born with nine lives -- or that they could lose them so quickly?
The Chronicles of Chrestomanci: Charmed Life / The Lives of Christopher Chant
The Subtle Art of Not Giving A F*ck