Question: Who is the mother-in-law of Stefano Casiraghi?
Sentence (from "Caroline, Princess of Hanover"): Until the births of her niece and nephew, Princess Gabriella and Prince Jacques, in December 2014, she had been heiress presumptive to the throne of Monaco since 2005, a position which she previously held from 1957 to 1958.
Relevant evidence: No