Ilona was born on April 16th, 1890. Ilona's father was Ferenc Körtvélyesi and her mother was Erzsébet Pausits. Her paternal grandparents were Vendel Körtvélyesi and Borbála Heveder. She had a brother and two sisters, named Ferenc, Janka and Rozália. She was the second youngest of the four children. She had a half-brother named Ferenc. She died at the age of 3 on October 5th, 1893.