Why does mother refuse to let Tim help Captain Betts in My Brother Sam Is Dead?

In "My Brother Sam Is Dead," Mother refuses to let Tim help Captain Betts because she is deeply concerned about the dangers of the Revolutionary War and wants to protect her family. She fears that involvement in the conflict could lead to further loss and hardship, especially after the toll the war has already taken on their lives. Her maternal instinct drives her to prioritize the safety and well-being of her children over any sense of duty or loyalty to the cause.