Not All Robots #2 (Mr)

In the year of 2056, robots have replaced human beings in the workforce. An uneasy co-existence develops between the newly intelligent robots and the ten billion humans living on Earth. Every human family is assigned a robot upon whom they are completely reliant. What could possibly go wrong? Meet the Walkers, a human family whose robot, Razorball, ominously spends his free time in the garage working on machines which they're pretty sure are designed to kill them.