 The second of three siblings, his two sisters were Elizabeth-Ann (1947–2020) and Christine Alix (1951–1989).By 1951, Rainier was the Prince of Monaco, but was unmarried and had no children.Some have reported that, citing the need for an heir to continue the throne of Monaco, Christian's mother Princess Antoinette sought to gauge support among Monegasque citizenry for a change to the constitution to place Christian upon the throne as a child, with his mother exercising sovereign authority as regent until his adulthood.