A Grass Valley man was arrested after allegedly stabbing his brother during an argument Wednesday evening. Grass Valley Police officers were called to an apartment in the 200 block of Sutton Way just after 5:30 p.m. with multiple reports of a stabbing. A man identified as Robert Allen Gordon, 48, got into a dispute with his 53-year-old brother and assaulted him with a 6-inch serrated knife, essentially a steak knife, said Grass Valley Police Capt. Rex Marks. The cause of the argument was not known. Gordon was “agitated” when officers arrived at the scene, but was subdued without further incident …