Claim: Margot Frank was the elder sister of Anne Frank.

Margot Betty Frank -LRB- February 16 , 1926 -- February 1945 -RRB- was the eldest daughter of Otto Frank and Edith Frank and the older sister of Anne Frank . Margot 's deportation order from the Gestapo hastened the Frank family into hiding . According to the diary of her younger sister , Anne , Margot kept a diary of her own , but no trace of Margot 's diary has ever been found . She died in Bergen-Belsen .