Revolution 19 by Gregg Rosenblum
Twenty years ago, the robots designed to fight our wars abandoned the battlefields. Then they turned their weapons on us. Headstrong seventeen-year-old Nick has spent his whole life in a community in the wilderness, hiding out from the robots that have enslaved mankind. But when the bots discover the community's location, he, his tech-geek younger brother, Kevin, and adopted sister, Cass, barely make it out alive, only to discover that their home has been destroyed and everyone they love is missing. All survivors were captured and taken to one of the robots' Cities. The siblings have been hearing tales about the Cities all their lives: humans are treated like animals, living in outdoor pens and forced to build new bots until they drop dead from exhaustion. Determined to find out if their parents are among the survivors, Nick, Kevin, and Cass venture into the heart of the City, but it is nothing like they've been told. As they live among the bots for the first time, they realize they're fighting for more than just their family. The robots have ruled for too long, and now it's time for a revolution.