Chelsea and Marc's first child and only daughter, Charlotte, was born on Sept. 27, 2014. As Chelsea is an only child, Charlotte was the first grandchild for Chelsea's parents, former President Bill Clinton and former US Secretary of State and 2016 presidential candidate Hillary Clinton. The day after Charlotte's birth, Hillary tweeted: "[Bill] and I are over the moon to be grandparents! One of the happiest moments of our life."