What is Mrs. Van daan's attitude toward her husband Mr. Frank in Anne diary act one scene 3 page 298

None. Mr. Frank is not Mrs. Van Daan's husband

Explanation:

Anne Frank's diary tells the story of Anne, a Jewish girl who lived in hiding with her family and other Jews, not to be taken to Nazi concentration camps and extermination. Unfortunately, the hideout was found and everyone was forced to go to the concentration camp, where Anne ended up dying.

The impactful account of the girl, led her diary to be one of the best selling books in the world, in addition, the book was adapted for films and even plays, like the one you mention in the question.

The other Jewish family that was hidden with the Anne Frank family, was the Van Daan family, which was composed of Ms. Van Daan, her husband, Mr. Van Daan, and her son Peter Van Daan.