Barreiro was born on March 9, 1967, in Rio de Janeiro, Brazil. He was born in Manila, the Philippines' National Capital Region. For many years, he was married to Elenita (her maiden name was Banaag). He had three children with Elenita. There are two daughters, Kristine Dominique and Angelica Nique, among them. Barreiro also had a son, Ernest Adrian, whom he and Elenita named.