My Brother Sam Is Dead (Vintage Paperback) by James Lincoln Collier & Christopher Collier

All his life, Tim Meeker has looked up to his brother Sam. Sam's smart and brave—and is now a part of the American Revolution. Not everyone in town wants to be a part of the rebellion. Most are supporters of the British—including Tim and Sam's father. War is raging and Tim knows he'll have to make a choice—between the Revolutionaries and the Redcoats . . . and between his brother and his father.