What notable event occurs to Anne Frank's family during World War II?

The notable event that occurs to Anne Frank's family during World War II is that they hid from the Nazis. The Frank family, along with others, went into hiding in the Secret Annex of Otto Frank's office building in Amsterdam to escape Nazi persecution. This act of hiding was a desperate measure to avoid deportation to concentration camps, where many Jews faced horrific fates during the Holocaust.

The family's experience during this period is profoundly documented in Anne's diary, which provides a personal and poignant account of their life in hiding, the struggles they faced, and Anne's reflections on her hopes and fears. This choice underscores the historical significance of their story and its impact on our understanding of the human experience during the Holocaust.