The Franks agree to take in Mr. Dussel in Act I because they want to help another Jewish person who is being persecuted by the Nazis and has nowhere else safe to go.

Quick Scoop: Core Reason

In the play version of The Diary of Anne Frank , Mr. Dussel is a Jewish dentist who is also being hunted under Nazi persecution. When Miep brings news that he needs a hiding place, the Franks feel a strong moral responsibility to share their already crowded, dangerous hiding spot rather than leave him outside to face arrest and likely deportation.

Compassion over Comfort

  • The Franks know that adding one more person will mean less space, more tension, and tighter food rations, but they still choose to accept him because saving a life matters more than their comfort.
  • Their decision shows their humanity and solidarity with other Jews suffering under the same Nazi laws and roundups.

How Tests Usually Phrase It

On most school quizzes and reading tests, the correct choice is usually along the lines of:

  • “They want to help someone else who is being persecuted by the Nazis.”

So, if you see a multiple‑choice question asking “In The Diary of Anne Frank, Act I, why do the Franks agree to take in Mr. Dussel?” the best answer is the one that emphasizes their desire to help another victim of Nazi persecution, not personal gain or convenience.

TL;DR: They take him in because he is another Jewish victim of Nazi persecution, and they feel it is right to help him, even at great risk and discomfort to themselves.

Information gathered from public forums or data available on the internet and portrayed here.