His father - Aladár Dsida - was an engineering officer in the Common Army of the Austro-Hungarian Empire.

His mother, Margit Csengeri Tóth lived in Beregszász and that is where she met and married her husband.

Jenő's childhood was shadowed by World War I and after that by the Romanian occupation.

During the war, his father was captured by the Russians, while his uncle was killed in Galicia.

In 1925, in cause of his parents' will, he studied law at the Franz Joseph University, but he never graduated.