Abraham Isaac "A.B." Quintanilla III (born December 13, 1963) better known as A.B., is an American songwriter, record producer and musician. He is the older brother of "The Queen of Tejano music" Selena. Along with Selena, his other sister Suzette, and his father Abraham, he became a member of Los Dinos in 1980 which would later include Selena's husband Chris Pérez as a guitarist. As a member of Los Dinos, A.B.