Antonio is the eldest of four siblings born to Reynerio Antonio and Joji Alonso is a film producer. After graduating with a degree in European Studies from the
Ateneo de Manila University, where he had finished his primary and secondary education, then he pursued his law degree at
San Beda College of Law and eventually graduated from
San Sebastian College, as a working student. He has played various roles in several indie films and was a member of the defunct group Voizboys. ==Personal life==