why dont you just tell him "look mutherfucker my nephew didnt rat u out , so fuck you your beat now lets settle this now bitch i'll beat ur fuckin face in, you wanna come to my work mutherfucker i'll beat the piss outta you" ,and then handle your buisness use a baseball bat or pistol if you have ,too.
im not into callin police on people, cause one , they probably wont do shit and two, thats a form of snitchin