Alejo Vidal-Quadras Veiga was born on April 12, 1919, in the upper bourgeoisie of Barcelona, Spain. Alejo and his elder brother Francisco Javier Vidal-Quadras Veiga receive a highly disciplined education.
In 1924 their parents Javier Vidal-Quadras y Villavecchia and Pilar Veiga de la Cuesta, move with them to France. Alejo is eleven years old when they return to Spain.