Explain the reason for the tension between Ponyboy and Darry?

The tension between Ponyboy and Darry is a direct result of their change in roles. Darry is no longer the older brother, who is an object of hero worship. He is mother, father, breadwinner, and caregiver. If any of the boys makes a mistake, they take the risk of being separated. Darry has accepted his roll. He has given up college, taken on a full time job, and is dedicated to maing things work. Ponyboy, however, is finding the transition difficult and resents his brother's actions.