Why is Tim envious of his brother Sam in my brother sam is dead?

In "My Brother Sam Is Dead," Tim is envious of his brother Sam primarily because of Sam's passion and commitment to the revolutionary cause during the American Revolution. Tim feels a sense of admiration for Sam's bravery and independence, which contrasts with his own feelings of helplessness and confinement within their family's expectations. Additionally, Tim grApples with the growing distance between them as Sam embraces his ideals, leading to a mix of envy and longing for the close bond they once shared.