Propper de Callejón's father, Maximilian "Max" Propper, was a Bohemian Jew, and his mother, Juana de Callejón, was a Spanish Catholic. They raised him as well as his brothers in the Catholic faith. His wife, Baroness Hélène Fould-Springer, was a socialite and painter.
Propper de Callejón's father, Maximilian "Max" Propper, was a Bohemian Jew, while his mother, Juana de Callejón, was a Spanish Catholic. They raised him and his brothers in the Catholic faith. His wife, Baroness Hélène Fould-Springer, was a socialite and painter.