Lina Berta van Wien, known as ‘Engelinchen’, married the dermatologist Dr Armand Oster in January 1913. The couple moved to Winzererstraße and had two children: their son Kurt Rudolf was born in 1913, and their daughter Lieselotte was born in 1919. Dr Armand Oster served as a doctor during the First World War; back in Munich, he practised as a dermatologist, became involved with the Lasker Chess Club, and in 1929 he joined FC Bayern Munich
After the Nazis came to power, the family had to leave their flat on Winzererstraße and move into the premises of Dr Oster’s medical practice on Theatinerstraße. In 1937, they had to move again, this time to Lindwurmstraße. In 1938, Dr Armand Oster had his medical licence revoked. He was no longer permitted to practise medicine and was instead forced to perform hard labour as a gardener. Lina Oster was also forced to perform hard labour; she had to work in a print shop.
Their son Kurt Rudolf was able to emigrate to Argentina, and their daughter Lieselotte managed to flee to Britain. Lina and Armand Oster also hoped to emigrate to Argentina. Dr Armand Oster had already begun learning Spanish in preparation for their planned emigration. In April 1941, they were granted entry permits for Argentina. However, their departure was delayed, and after the Nazis banned all Jews from emigrating in October 1941, the Oster couple were trapped in Germany. In November 1941, the Gestapo deported Dr Armand Oster and his wife Lina to Kaunas, where they were shot on 25 November 1941.