Question: Sapphire Battersea is the 2011 sequel to "Hetty Feather", written by best selling English author Jacqueline Wilson, whose  children's novels frequently feature themes of adoption, divorce and  what type of illness?
Sentence (from "Sapphire Battersea"): Sapphire Battersea is the 2011 sequel to "Hetty Feather", written by best selling English author Jacqueline Wilson.
Relevant evidence: Yes