What does Jem's refusal to obey Atticus indicate with respect to Jem's character?

Jem can feel the threat of violence in the air. He knows his father is in danger and refuses to leave. Jem shows determination much like his father's. Jem is doing the right thing even at the expense of his own safety and disobeying his father's orders to go home. Jem is truly turning into a young man of principle.