 Buenaventura was one of four siblings.His eldest brother, Cesar A. Buenaventura, was former Chairman and CEO of Pilipinas Shell, and is a partner at the investment advisory and merchant bank, Buenaventura, Echauz and Associates.His other brother, Jose, is a lawyer and is a senior partner at Romulo Mabanta, Buenaventura, Sayoc and Angeles Law Offices, one of the most prominent law firms in the country.