Johanna de Winter was a daughter of Michiel de Winter and Schoontje Mug. She married Mozes Coppenhagen in Rotterdam on 9 August 1939, a son of Salomon Coppenhagen and Sophia Koopman. On 20 December 1942 their daughter Schoontje was born in Camp Westerbork. She was killed in Sobibor on 5 March 1943, together with her mother. Johanna's husband Mozes lost his life in Lublin on 30 November 1943.
City Archive of Rotterdam, family registration card of Michiel de Winter and City Archive of Amsterdam, archive card of Mozes Coppenhagen.