After living with the outlaws on the hill for so long, Daniel is unable to reconnect with his own family. His grandmother is older than he remembers and his sister is agoraphobic and almost doesn't remember him. He finds that he doesn't feel safe or at home here, and that he wants to go back to the hills and live with the outlaws as he has become accustomed to for the last several years.

Why did I come here? he thought... Up on the mountain the men would be still sitting about the fire, their stomachs satisfied with stolen mutton and grape wine, joking and telling boastful stories. Later they would wrap their cloaks about them and sleep with their lungs full of clean mountain air... Suddenly he flung himself on his face and buried his head in his arms and could have wept for homesickness.
(Speare, The Bronze Bow, Google Books)

This shows how his mind and emotions have been warped by his upbringing with the outlaws. Instead of a group of people, family and friends, to create a healthy  emotional balance, Daniel has had only Rosh and his outlaws to socialize with, and so only sees life through the prism of excess masculinity and subjective ethics. It takes the death of his grandmother, and the memories this evokes, to make him realize that he has been missing something in his life by living in isolation.