Dr. Roman Sondermajer married Stanislava Durić, daughter of Minister of Defence General Dimitrije Đurić, and granddaughter of Minister of Education Dimitrije Matić, 
Stanislava Sondermajer was a member of the Circle of Serbian Sisters, a humane society of volunteer nurses, following the Austro-Hungarian attack on Serbia, the Circle of Serbian Sisters relocated from Belgrade to the wartime capital Niš, where its members worked in the town's hospital, collecting money and clothes for the wounded.

Stanislava died of illness in 1914.

Dr. Roman Sondermajer and Stanislava had four children, three sons and one daughter, every member of the family volunteer in the wars, two of their children died during the First World War.

Jadwiga was a volunteer nurse she died in 1914 after contracting typhus on the battlefield.

Stanisław Sondermajer was the youngest Serbian soldier to die during the battle of Cer, a month away from his sixteenth birthday, he had run away to join the Third Cavalry Regiment under the command of Colonel Peter Savatic as soon as he heard that Serbia was invaded.
He participated in the Battle of Cer where he was fatally wounded on August 5.

Wladislaw Sondermajer (1894–1956) was a decorated fighter pilot of the First World War, lieutenant colonel in the Yugoslav Air Force.

Tadeusz (Tadija) Sondermajer (1892–1967) was a decorated fighter pilot of the First World War and an aviation pioneer who started the first Yugoslav airline Aeroput after the war;  during the Second World War both sons, Stanislav and Mihailo, joined the chetniks resistance fighting the nazi occupants, at respectively the age of 17 and 13.
Dr. Roman Sondermajer married Stanislava Durić, daughter of Minister of Defence General Dimitrije Đurić, and granddaughter of Minister of Education Dimitrije Matić, 
Stanislava Sondermajer was a member of the Circle of Serbian Sisters, a humane society of volunteer nurses, following the Austro-Hungarian attack on Serbia, the Circle of Serbian Sisters relocated from Belgrade to the wartime capital Niš, where its members worked in the town's hospital, collecting money and clothes for the wounded.
Stanislava died of illness in 1914. 
Dr. Roman Sondermajer and Stanislava had four children, three sons and one daughter, every member of the family volunteer in the wars, two of their children died during the First World War. 
Jadwiga was a volunteer nurse she died in 1914 after contracting typhus on the battlefield.
Stanisław Sondermajer was the youngest Serbian soldier to die during the battle of Cer, a month away from his sixteenth birthday, he had run away to join the Third Cavalry Regiment under the command of Colonel Peter Savatic as soon as he heard that Serbia was invaded. He participated in the Battle of Cer where he was fatally wounded on August 5.
Wladislaw Sondermajer (1894–1956) was a decorated fighter pilot of the First World War, lieutenant colonel in the Yugoslav Air Force.
Tadeusz (Tadija) Sondermajer (1892–1967) was a decorated fighter pilot of the First World War and an aviation pioneer who started the first Yugoslav airline Aeroput after the war;  during the Second World War both sons, Stanislav and Mihailo, joined the chetniks resistance fighting the nazi occupants, at respectively the age of 17 and 13.
Roman Sondermajer