Margot Betti Frank, born on 16 February 1926 in Frankfurt am Main, Germany, was the eldest child of Otto and Edith Frank. Her mother meticulously chronicled her infancy in a baby book, documenting milestones such as her first words and steps. Family acquaintances characterized her as precise and conscientious, dubbing her a “little princess” in childhood. After attending school in Germany, she relocated to the Netherlands at seven amid escalating antisemitism. Academically gifted, she earned high marks in mathematics and science, impressing teachers and classmates with her quiet diligence.

In 1940, Margot exchanged letters with an American pen pal, voicing fears about encroaching war and Germany’s proximity to the Netherlands. Under Nazi occupation, antisemitic decrees forced her transfer to Amsterdam’s Jewish Lyceum in 1941. Despite bans on activities like swimming and tennis, she maintained academic excellence, a fact her sister Anne later highlighted. On 5 July 1942, Margot’s summons to a labor camp spurred the family into hiding the following day.

Within the Secret Annex, Margot immersed herself in studies—languages, sciences, medicine—and tutored housemate Fritz Pfeffer in Dutch. She harbored ambitions to work as a maternity nurse in Palestine. Though often reserved, her relationship with Anne shifted from sibling rivalry to guarded camaraderie. A turning point came when Margot privately confessed her longing for a confidant in a letter to Anne, echoing her sister’s earlier isolation.

Margot’s wartime diary, mentioned by Anne, was lost after their arrest on 4 August 1944. Witnesses recalled her silent tears during the capture. Deported to Westerbork and Auschwitz-Birkenau, she and Anne were later moved to Bergen-Belsen in late 1944. There, amid rampant typhus, overcrowding, and deprivation, Margot succumbed to the disease in February 1945, mere weeks before the camp’s liberation.