Otto Frank married former Amsterdam neighbor and fellow Auschwitz survivor Elfriede Geiringer (1905–1998) in Amsterdam on 10 November 1953, and both moved to Basel, Switzerland, where he had family, including relatives' children, with whom he shared his experiences.
Otto Frank menikah dengan mantan tetangganya dari Amsterdam dan korban selamat Auschwitz, Elfriede Geiringer (1905–1998), di Amsterdam pada 10 November 1953, dan keduanya pindah ke Basel, Swiss, dimana ia memiliki keluarga, termasuk anak-anak kerabatnya, dengan mereka ia membagikan pengalaman-pengalamannya.