His father was a Hungarian immigrant, and his mother was German.
Gunther Gerzso was born on June 17, 1915 in Mexico City, Mexico. He was a son of Oscar Gerzso, and Dore Wendland. Gunther's father died a few months after he had been born, and his mother married a German jeweler. The economic crisis during the Mexican Revolution forced the family to flee to Europe in 1922. Two years later, they came back to Mexico. During that time, Gunther's mother wasn't able to provide children with all the necessary things and she decided to send Gunther to Switzerland to live with his uncle Hans Wendland, who was a renowned art dealer. Some time later, in 1931, due to the impact of the Great Depression in Europe, Dr. Wendland sent the boy back to his mother in Mexico City.