An Indianapolis man was found guilty Wednesday of forcing his three grandsons to take brutal hikes through the Grand Canyon. An Arizona jury convicted Christopher Carlson, 45, on three of six charges of child abuse for the hikes that took place last August. Prosecutors said Carlson forced his grandchildren to go on a brutal 18-mile walk in 100-degree temperatures without food or water. Carlson claimed the boys, who were 8, 9 and 12 at the time, needed to get in shape because they are overweight. The boys are now in protective custody.