Mordka (Motel) Choroszcz was born in Zambrow circa 1900 to Lipman Dov Ber Choroszcz and Elka Libbe. He was one of six children. The family lived on ul. 15 St. Kryszka just off the Stara Miesta.

Mordka was drafted into military service and served during the First World War. While stationed in Galicia, he met and married a woman that is unknown to his descendants, nor do they have any knowledge of the family. They were never heard from, nor did they ever hear anything about them after the war.