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Born Otto Loupen Frank
12 May 1889
Frankfurt am Main, German Empire
Died 19 August 1980 (aged 91) Birsfelden, Basel-Landschaft, Switzerland
Cause of death Lung cancer
Nationality German (rev), Dutch, Swiss
Occupation Banker, spice merchant
Known for father of Anne Frank; The Diary of a Young Girl
Religion Jewish
Spouse(s) 1) Edith Holländer (1925-1945; her death)
Elfriede Geiringer (1953-80; his death)
Children Margot Frank (eldest daughter), Anne Frank (youngest daughter)
Parents Michael Frank, Alice Stern Frank

    Early life
He was the second son of Michael Frank and Alice Stern Frank. His siblings were Robert Frank, Helene (Leni) Frank, and Herbert Frank. Frank served in the German army as an officer during the First World War. He worked in the bank his family ran until it collapsed in the early 1930s. He married Edith Holländer—an heiress to a scrap-metal and industrial-supply business—on 12 May 1925 in Frankfurt, and their first daughter, Margot Betti, was born on 16 February 1926, followed by Anne (Annelies Marie) on 12 June 1929.

(all information gathered from- http://en.wikipedia.org/wiki/Otto_Frank)