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 "Jacqueline Wilson"): Dame Jacqueline Wilson, DBE, FRSL (née Aitken; born 17 December 1945) is an English writer of children's literature.
Relevant evidence: No