He was born to his mother, Lucia Chiellini (a business manager) and to his father, Fabio Chiellini (an orthopedist at the time of Chiellini's birth).
Wazalelwa kunina, u-Lucia Chiellini (umphathi webhizinisi) noyise, uFabio Chiellini (isifuba samathambo ngesikhathi sokuzalwa kukaChiellini).