Question: why dhritarashtra imprisoned shakuni family?
Answer: Shakuni, his father, his brothers, his uncles, and his cousins were imprisoned, with Hastinapur arguing it was to restore dharma to Gandhara, but Shakuni claiming that it was a pure power-grab. When the Gandhara royal family argued that food must be given to prisoners, only one grain of rice is given to each captive.