In The Outsiders, Ponyboy Curtis lives with his two older brothers, Darry and Sodapop. Pony is 14 and Darry is 20. Their parents have been killed some time before and Darry has been working to support them.
Because of this, Darry has to act toward Pony more like a father than an older brother. This makes their relationship pretty tense. Pony feels that Darry is too harsh with him. He thinks that Darry yells at him too much and puts too much pressure on him.
By the end of the book, though, they come to understand each other better and it seems likely their relationship will improve.