Secret (The Outsiders)

Dallas Winston always kept his little sister a secret. Why? He didn't want his tough guy rep to be ruined. He cared for his sister like a father. Lolita always kept to herself though. No one knew she had any relation to Dallas. Sure she hung around him and the other greasers, but she was just another greaser to them. She'd even been mistaken as Dally girlfriend. She hated when people thought that. She hated that Dally hadn't even told his best buds that she was his sister.

One night, Dally and Lolita have a fight. Lolita runs out of the house and ends up at the home of the Curtis brothers. When Dally tries to get her to come home, she refuses to return home unless Dally does one thing. She'll come home once he admits that Lolita is his kid sister