The girls attended the 6th Montessori School (renamed after Anne Frank in 1957) in Amsterdam and then the Jewish Lyceum.

Goslar and her young sister were the only family members who survived the war, being rescued from the Lost Train.

[1][2] Her father was deputy minister for domestic affairs, and the ministry's chief of public relations (Leiter der Pressestelle) in Germany until 1933,[1] and her mother was a teacher.

They were also close friends with Susanne "Sanne" Ledermann, who lived in the same area but attended a different school, and later with Ilse Wagner and Jacqueline van Maarsen.

[8] Hannah’s sister Rachel Gabriela Ida ("Gabi" or "Gigi") was born in Amsterdam on 25 October 1940.

[1] In June 1943, Hannah, her father, her maternal grandparents, and her younger sister were arrested and sent to the Westerbork transit camp, where her grandfather died in November 1943 of a heart attack.

[5] Hannah was in a privileged section of the camp because her family had Mandatory Palestine papers and Paraguayan passports with them.

[6] Sometime between January and February 1945, she was briefly reunited with Anne Frank, who was a less privileged prisoner at the other side of the camp.

After the war Hannah said she spoke to Auguste Van Pels through the fence, finding out that Anne was on the other side.

[1] Russian authorities allowed Americans to register Goslar and her sister at the end of June 1945, and they returned to Amsterdam.

[14] The 1997 book Memories of Anne Frank: Reflections of a Childhood Friend,[15] by Holocaust author Alison Leslie Gold, is based upon extensive interviews with Hannah.