Question: Who is Princess Antoinette, Baroness Of Massy's sibling-in-law?
Sentence (from "Rainier III, Prince of Monaco"): Rainier III (Rainier Louis Henri Maxence Bertrand Grimaldi; 31 May 1923 – 6 April 2005) was the Prince of Monaco from 1949 to his death in 2005.
Relevant evidence: No