Eva Schloss, an Auschwitz survivor who dedicated her life to speaking out against prejudice and to preserving the legacy of her stepsister Anne Frank, died on Jan. 10 in London. She was 96.

“We hope her legacy will continue to inspire through the books, films and resources she leaves behind,” Ms. Schloss’s family said in a statement published by the Anne Frank Trust UK, an organization she co-founded to challenge intolerance and educate young people about the Holocaust. After WWII, her mother married Anne Frank’s father, Otto, the sole survivor of the Frank family.

For more than 40 years, Ms. Schloss remained silent about the horrors she endured at Auschwitz, to which she had been deported as a teenager. When her grandchildren once asked about the tattoo on her arm that she had been branded with at Auschwitz, a-5272, she told them it was her telephone number.

It was not until 1986, when she was invited to speak at the opening of a traveling Anne Frank exhibition in London, that she began to tell her story publicly. From that point on, and into her 90s, she traveled widely to speak about the dangers of injustice.