The main reason behind Miss Frank accusing Mr. van Daan of being a poor father because He is discovered taking bread as the kids go without taking the Food.
Food was a constant concern while everyone was in hiding, so the three families—the Franks, Van Daan, and Dussel—stayed together and shared small portions the act of stealing was a sign of being a poor father according to Miss frank, He should have shared the food among all equally as it was a emergency situation. Instead of giving the food to the kids he was more concerned on eating for himself.
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