The van Daans are a family that hides alongside Anne Frank’s family in some concealed rooms before they are discovered and sent to the concentration camps. Mr. van Daan worked with Anne’s farther and his actual name is Hermann van Pels. The name van Daan was used by Anne in the diary to refer to the van Pels. Anne Frank portrays Mr. van Daan as an intelligent, temperamental and selfish individual who makes life hard in their hiding place.
Mrs. Petronella Van Daan (her actual name is Auguste) is portrayed as a friendly but egotistical individual. She is also considered argumentative and petty, as seen when she frequently complains and openly argues with the husband.
Peter van Daan is the son of Mr. and Mrs. van Daan. At some point in the diary Peter and Anne develop a romantic relationship and grow very close. He is portrayed as a quiet and honest boy.