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He is Anne's favorite relative; she often calls him "Pim" and considers him her savior and confidant in the annex. He is the sole surviving member of his family after the war. Otto bares much of the weight of keeping hidden in the annex. He tries to stay out of conflicts and seldom complains. Mr. Van Daan arranges for his family to live with the Franks in the annex of their former establishment. Anne considers him to be an insufferable know-it-all, though she reserves the majority of her ire for his wife.