Prince Jacques is the younger of Prince Albert and Princess Charlene's twins. His older sister is Princess Gabriella. They were born on December 10, 2014, at the Princess Grace Hospital Centre in Monaco.
Jacques is two minutes younger than his sister. They were both baptized into the Roman Catholic Church on May 10, 2015, at Monaco's St. Nicholas Cathedral.
He and Gabriella have an older half-sister, Jazmin and older half-brother Alexandre through previous relationships of their father.