Task: Question Answering
Input (English): Passage: Donna Foster works for publisher John Caine. She agrees to have his niece, Christabel, live with her in San Francisco while attending business school.
Christabel proves to be a scheming, socially ambitious woman. She flirts with Donna's fiance, the wealthy Curtis Carey, at a party for Donna's friend, painter Gabriel Broome. She also attracts the interest of aspiring author Nick Bradley.
While having her portrait done by Broome, a call from Curtis brings her eagerly to a jeweler, only to discover to her disappointment that he merely seeks her advice in buying Donna an engagement gift. After he purchases an expensive one, Christabel plants a seed of doubt in Donna's mind and makes her feel guilty by insinuating that in accepting such a lavish gift, Donna is giving Curtis the appearance of being after his money.
Christabel then turns around and cunningly does the same to Curtis by convincing him to propose a pre-nuptial agreement. Donna is offended and the couple break up, which turns out to have been Christabel's plan all along. With Curtis now available, Christabel rebuffs a marriage proposal from Nick, whose novel is about to be published by Caine.
A romance develops that leads to Christabel marrying Curtis and becoming a high society lady. However, it turns out that she is still attracted to Nick, whom she begins seeing on the side. On one occasion, she slips away from a vacation resort, telling Curtis that she is going to see her aunt Clara. Her lie is exposed by Caine, her uncle, who informs Curtis that the aunt had died while Christabel claimed to be visiting her.
Curtis reunites with Donna after sending away Christabel with nothing more than a few expensive furs. She gets into an accident and is hospitalized, but promptly begins a flirtation with her doctor, showing that she is truly incorrigible. 
Question: What is the full name of Christabel's uncle?
Output (English): John Caine.