Margot Frank was Anne Frank's sister.
Anne Frank . In October or November 1944 , Anne and her sister , Margot , were transferred to Bergen-Belsen concentration camp from Auschwitz , where they died ( probably of typhus ) a few months later . Margot Betty Frank ( February 16 , 1926 -- February 1945 ) was the eldest daughter of Otto Frank and Edith Frank and the older sister of Anne Frank . 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 .