House of Robots: Robots Go Wild! - James Patterson

In book two of the House of Robots series, it's 'bot brains versus 'bot brawn in an all-out war Sammy Hayes-Rodriguez and his bro-bot E are making new friends every day as E works as his bedridden sister Maddie's school proxy. But disaster strikes when E malfunctions just in time to be upstaged by the super-cool new robot on the block-and loses his ability to help Maddie. Now it's up to Sammy to figure out what's wrong with E and save his family