Krystyna was the eldest child in the Kintzel family. Danuta (Diana) referred to her at times with the nickname of “Mama,” since Krystyna was ten years older than she was. Krystyna traveled to Warsaw for her sister’s wedding, despite the risk of traveling in wartime, and perhaps with the knowledge that Diana was marrying a Jewish man. If the wedding had been infiltrated by the Gestapo, Krystyna would undoubtedly have been imprisoned and killed.

Krystyna was an independent single woman who owned and managed a drugstore in Zamosc, where she lived. She married Longin Prus, and after the war they moved to the town of Gliwice, in the southwest of Poland, with their son and daughter. Krystyna lived there for the rest of her life. It was a great distance from her beloved little sister, Danuta (Diana), who had immigrated to the Americas together with Stanley Steyer.