Answer:
Darry and Sodapop Curtis are Ponyboy's older brothers who, along with being greasers, are adjusting to life on their own. Darry has taken over the responsibility of guardianship, forfeiting college and working to enable the three of them to stay together. Soda, never very good in school, has dropped out at age 16 and is working to help support the family.
Both boys focus on the future of Ponyboy; ensuring his success is the driving force of the family.